Essonne water level at Boulancourt today

Is the Essonne at Boulancourt within its normal range for the date?

The Essonne at Boulancourt read 0.779 m at 15:00 CET on 26 October 2026.

NowHistoryThis dateBy year

Level now

within the normal range for the date

0.779 m

15:00 CET on 26 October 2026Provisional

within the normal range for the date

The normal range for 26 October is 0.42 m to 0.87 m: the 10th to 90th percentile of the daily highs from 19 October to 2 November in 40 years between 1985 and 2025.

Table: where the water stands

Level	Value
Newest reading	0.779 m, 15:00 CET on 26 October 2026
Normal range for the date	0.42 m to 0.87 m
Median for the date	0.77 m

Past day: +0.005 m
Past week: +0.025 m

The gauge reads the height of the water above a fixed zero, not the depth of the river. Its zero lies at 72.801 m above NGF-IGN69 (the French sea-level datum).

Level history

within the normal range for the date

On 25 October 2026 the Essonne at Boulancourt averaged 0.779 m.

Three monthsOne yearTen yearsAll time

The last 90 days, against the normal range for each day

Level
Normal range for the date
Median for the date
A year earlier
Our record

Daily highs of the Essonne at Boulancourt from 28 July 2026 to 25 October 2026, with the normal range for each day and the same days a year earlier.

Table: The last 90 days, against the normal range for each day

Day	Daily high (m)	Normal range	Median	A year earlier
28 July 2026	0.726 m	0.247 m to 0.838 m	0.733 m	0.843 m
29 July 2026	0.725 m	0.239 m to 0.837 m	0.733 m	0.838 m
30 July 2026	0.725 m	0.239 m to 0.837 m	0.731 m	0.832 m
31 July 2026	0.724 m	0.237 m to 0.837 m	0.731 m	0.832 m
1 August 2026	0.725 m	0.235 m to 0.835 m	0.731 m	0.835 m
2 August 2026	0.724 m	0.234 m to 0.835 m	0.730 m	0.835 m
3 August 2026	0.721 m	0.230 m to 0.834 m	0.729 m	0.832 m
4 August 2026	0.721 m	0.228 m to 0.834 m	0.729 m	0.830 m
5 August 2026	0.721 m	0.220 m to 0.832 m	0.729 m	0.827 m
6 August 2026	0.722 m	0.215 m to 0.832 m	0.728 m	0.821 m
7 August 2026	0.719 m	0.214 m to 0.829 m	0.727 m	0.815 m
8 August 2026	0.718 m	0.208 m to 0.827 m	0.727 m	0.812 m
9 August 2026	0.718 m	0.208 m to 0.824 m	0.727 m	0.805 m
10 August 2026	0.716 m	0.214 m to 0.823 m	0.727 m	0.803 m
11 August 2026	0.717 m	0.218 m to 0.822 m	0.727 m	0.799 m
12 August 2026	0.717 m	0.218 m to 0.822 m	0.727 m	0.799 m
13 August 2026	0.715 m	0.218 m to 0.821 m	0.727 m	0.796 m
14 August 2026	0.716 m	0.218 m to 0.818 m	0.727 m	0.792 m
15 August 2026	0.713 m	0.208 m to 0.822 m	0.727 m	0.796 m
16 August 2026	0.718 m	0.207 m to 0.822 m	0.726 m	0.788 m
17 August 2026	0.722 m	0.205 m to 0.823 m	0.726 m	0.782 m
18 August 2026	0.722 m	0.207 m to 0.823 m	0.726 m	0.782 m
19 August 2026	0.716 m	0.208 m to 0.823 m	0.726 m	0.784 m
20 August 2026	0.724 m	0.210 m to 0.823 m	0.726 m	0.810 m
21 August 2026	0.727 m	0.210 m to 0.824 m	0.727 m	0.830 m
22 August 2026	0.727 m	0.213 m to 0.825 m	0.728 m	0.825 m
23 August 2026	0.724 m	0.215 m to 0.825 m	0.728 m	0.827 m
24 August 2026	0.733 m	0.219 m to 0.828 m	0.730 m	0.844 m
25 August 2026	0.727 m	0.219 m to 0.829 m	0.731 m	0.804 m
26 August 2026	0.730 m	0.220 m to 0.829 m	0.732 m	0.795 m
27 August 2026	0.736 m	0.224 m to 0.830 m	0.733 m	0.793 m
28 August 2026	0.764 m	0.225 m to 0.830 m	0.733 m	0.795 m
29 August 2026	0.745 m	0.226 m to 0.827 m	0.733 m	0.800 m
30 August 2026	0.740 m	0.229 m to 0.826 m	0.732 m	0.807 m
31 August 2026	0.743 m	0.231 m to 0.824 m	0.732 m	0.806 m
1 September 2026	0.744 m	0.232 m to 0.823 m	0.733 m	0.817 m
2 September 2026	0.737 m	0.235 m to 0.826 m	0.733 m	0.827 m
3 September 2026	0.739 m	0.236 m to 0.826 m	0.733 m	0.868 m
4 September 2026	0.736 m	0.239 m to 0.827 m	0.733 m	0.851 m
5 September 2026	0.741 m	0.239 m to 0.827 m	0.733 m	0.826 m
6 September 2026	0.740 m	0.245 m to 0.827 m	0.733 m	0.826 m
7 September 2026	0.735 m	0.250 m to 0.828 m	0.733 m	0.823 m
8 September 2026	0.741 m	0.251 m to 0.830 m	0.733 m	0.821 m
9 September 2026	0.746 m	0.263 m to 0.834 m	0.733 m	0.827 m
10 September 2026	0.739 m	0.275 m to 0.837 m	0.734 m	0.824 m
11 September 2026	0.738 m	0.276 m to 0.838 m	0.734 m	0.924 m
12 September 2026	0.736 m	0.276 m to 0.840 m	0.734 m	0.827 m
13 September 2026	0.734 m	0.287 m to 0.844 m	0.735 m	0.826 m
14 September 2026	0.737 m	0.294 m to 0.848 m	0.736 m	0.839 m
15 September 2026	0.735 m	0.302 m to 0.850 m	0.736 m	0.844 m
16 September 2026	0.736 m	0.307 m to 0.851 m	0.736 m	0.834 m
17 September 2026	0.744 m	0.310 m to 0.851 m	0.736 m	0.871 m
18 September 2026	0.737 m	0.310 m to 0.851 m	0.736 m	0.827 m
19 September 2026	0.735 m	0.310 m to 0.851 m	0.738 m	0.851 m
20 September 2026	0.734 m	0.311 m to 0.852 m	0.741 m	0.822 m
21 September 2026	0.732 m	0.316 m to 0.853 m	0.742 m	0.835 m
22 September 2026	0.731 m	0.320 m to 0.854 m	0.742 m	0.855 m
23 September 2026	0.732 m	0.322 m to 0.856 m	0.743 m	0.841 m
24 September 2026	0.743 m	0.325 m to 0.857 m	0.743 m	0.957 m
25 September 2026	0.737 m	0.324 m to 0.856 m	0.743 m	0.851 m
26 September 2026	0.734 m	0.329 m to 0.856 m	0.745 m	0.843 m
27 September 2026	0.735 m	0.332 m to 0.856 m	0.746 m	0.838 m
28 September 2026	0.737 m	0.332 m to 0.856 m	0.747 m	0.835 m
29 September 2026	0.740 m	0.329 m to 0.855 m	0.748 m	0.837 m
30 September 2026	0.753 m	0.330 m to 0.853 m	0.748 m	0.882 m
1 October 2026	0.750 m	0.330 m to 0.856 m	0.748 m	0.840 m
2 October 2026	0.748 m	0.330 m to 0.856 m	0.749 m	0.830 m
3 October 2026	0.744 m	0.329 m to 0.857 m	0.749 m	0.830 m
4 October 2026	0.742 m	0.332 m to 0.857 m	0.751 m	0.853 m
5 October 2026	0.743 m	0.337 m to 0.857 m	0.752 m	0.846 m
6 October 2026	0.743 m	0.337 m to 0.857 m	0.753 m	0.843 m
7 October 2026	0.753 m	0.337 m to 0.857 m	0.754 m	0.834 m
8 October 2026	0.779 m	0.341 m to 0.857 m	0.753 m	0.878 m
9 October 2026	0.764 m	0.341 m to 0.857 m	0.755 m	0.834 m
10 October 2026	0.757 m	0.341 m to 0.862 m	0.755 m	0.829 m
11 October 2026	0.757 m	0.342 m to 0.864 m	0.756 m	0.829 m
12 October 2026	0.755 m	0.342 m to 0.868 m	0.757 m	0.830 m
13 October 2026	0.751 m	0.342 m to 0.870 m	0.757 m	0.834 m
14 October 2026	0.753 m	0.347 m to 0.872 m	0.758 m	0.830 m
15 October 2026	0.753 m	0.350 m to 0.872 m	0.758 m	0.828 m
16 October 2026	0.756 m	0.350 m to 0.872 m	0.758 m	0.829 m
17 October 2026	0.755 m	0.351 m to 0.872 m	0.758 m	0.831 m
18 October 2026	0.756 m	0.351 m to 0.872 m	0.759 m	0.828 m
19 October 2026	0.758 m	0.352 m to 0.872 m	0.761 m	0.829 m
20 October 2026	0.758 m	0.361 m to 0.871 m	0.762 m	0.838 m
21 October 2026	0.763 m	0.366 m to 0.872 m	0.764 m	0.839 m
22 October 2026	0.777 m	0.370 m to 0.872 m	0.766 m	0.844 m
23 October 2026	0.778 m	0.380 m to 0.871 m	0.768 m	0.840 m
24 October 2026	0.769 m	0.384 m to 0.869 m	0.768 m	0.841 m
25 October 2026	0.779 m	0.404 m to 0.868 m	0.769 m	0.837 m

The last 12 months, against the normal range for each day

Level
Above the normal range
Normal range for the date
Median for the date
Our record

Daily highs of the Essonne at Boulancourt from 25 October 2025 to 25 October 2026, with the normal range for each day.

Table: The last 12 months, against the normal range for each day

Day	Daily high (m)	Normal range	Median
25 October 2025	0.837 m	0.404 m to 0.868 m	0.769 m
26 October 2025	0.836 m	0.417 m to 0.868 m	0.771 m
27 October 2025	0.845 m	0.417 m to 0.868 m	0.772 m
28 October 2025	0.847 m	0.418 m to 0.868 m	0.774 m
29 October 2025	0.848 m	0.418 m to 0.869 m	0.774 m
30 October 2025	0.855 m	0.421 m to 0.871 m	0.775 m
31 October 2025	0.855 m	0.421 m to 0.874 m	0.775 m
1 November 2025	0.850 m	0.421 m to 0.874 m	0.776 m
2 November 2025	0.847 m	0.424 m to 0.874 m	0.779 m
3 November 2025	0.847 m	0.429 m to 0.874 m	0.780 m
4 November 2025	0.841 m	0.429 m to 0.875 m	0.781 m
5 November 2025	0.840 m	0.429 m to 0.875 m	0.781 m
6 November 2025	0.841 m	0.429 m to 0.879 m	0.781 m
7 November 2025	0.844 m	0.429 m to 0.883 m	0.780 m
8 November 2025	0.845 m	0.429 m to 0.885 m	0.780 m
9 November 2025	0.842 m	0.429 m to 0.891 m	0.780 m
10 November 2025	0.840 m	0.429 m to 0.894 m	0.780 m
11 November 2025	0.839 m	0.429 m to 0.894 m	0.780 m
12 November 2025	0.839 m	0.432 m to 0.894 m	0.781 m
13 November 2025	0.839 m	0.432 m to 0.897 m	0.781 m
14 November 2025	0.839 m	0.432 m to 0.897 m	0.782 m
15 November 2025	0.839 m	0.432 m to 0.898 m	0.782 m
16 November 2025	0.839 m	0.432 m to 0.899 m	0.783 m
17 November 2025	0.837 m	0.432 m to 0.901 m	0.784 m
18 November 2025	0.835 m	0.432 m to 0.902 m	0.784 m
19 November 2025	0.836 m	0.429 m to 0.902 m	0.784 m
20 November 2025	0.841 m	0.419 m to 0.903 m	0.784 m
21 November 2025	0.841 m	0.415 m to 0.904 m	0.784 m
22 November 2025	0.840 m	0.405 m to 0.904 m	0.785 m
23 November 2025	0.845 m	0.403 m to 0.904 m	0.786 m
24 November 2025	0.890 m	0.402 m to 0.905 m	0.786 m
25 November 2025	0.862 m	0.405 m to 0.906 m	0.786 m
26 November 2025	0.852 m	0.404 m to 0.908 m	0.786 m
27 November 2025	0.841 m	0.468 m to 0.908 m	0.787 m
28 November 2025	0.842 m	0.441 m to 0.908 m	0.787 m
29 November 2025	0.847 m	0.433 m to 0.909 m	0.788 m
30 November 2025	0.848 m	0.425 m to 0.908 m	0.789 m
1 December 2025	0.848 m	0.427 m to 0.910 m	0.791 m
2 December 2025	0.841 m	0.433 m to 0.915 m	0.793 m
3 December 2025	0.842 m	0.478 m to 0.915 m	0.794 m
4 December 2025	0.870 m	0.485 m to 0.913 m	0.796 m
5 December 2025	0.853 m	0.485 m to 0.908 m	0.797 m
6 December 2025	0.852 m	0.485 m to 0.905 m	0.797 m
7 December 2025	0.865 m	0.485 m to 0.903 m	0.798 m
8 December 2025	0.876 m	0.485 m to 0.902 m	0.799 m
9 December 2025	0.871 m	0.485 m to 0.901 m	0.800 m
10 December 2025	0.853 m	0.485 m to 0.901 m	0.802 m
11 December 2025	0.847 m	0.485 m to 0.902 m	0.802 m
12 December 2025	0.847 m	0.488 m to 0.904 m	0.803 m
13 December 2025	0.844 m	0.488 m to 0.905 m	0.805 m
14 December 2025	0.842 m	0.491 m to 0.906 m	0.807 m
15 December 2025	0.842 m	0.494 m to 0.906 m	0.807 m
16 December 2025	0.842 m	0.504 m to 0.907 m	0.808 m
17 December 2025	0.841 m	0.504 m to 0.906 m	0.808 m
18 December 2025	0.839 m	0.498 m to 0.907 m	0.809 m
19 December 2025	0.845 m	0.501 m to 0.907 m	0.809 m
20 December 2025	0.848 m	0.501 m to 0.908 m	0.809 m
21 December 2025	0.865 m	0.495 m to 0.909 m	0.809 m
22 December 2025	0.892 m	0.494 m to 0.915 m	0.809 m
23 December 2025	0.892 m	0.464 m to 0.918 m	0.808 m
24 December 2025	0.864 m	0.467 m to 0.929 m	0.808 m
25 December 2025	0.848 m	0.464 m to 0.938 m	0.806 m
26 December 2025	0.841 m	0.471 m to 0.942 m	0.807 m
27 December 2025	0.836 m	0.481 m to 0.942 m	0.807 m
28 December 2025	0.833 m	0.482 m to 0.943 m	0.807 m
29 December 2025	0.833 m	0.487 m to 0.952 m	0.808 m
30 December 2025	0.832 m	0.493 m to 0.959 m	0.808 m
31 December 2025	0.829 m	0.493 m to 0.959 m	0.808 m
1 January 2026	0.828 m	0.494 m to 0.959 m	0.808 m
2 January 2026	0.831 m	0.502 m to 0.957 m	0.808 m
3 January 2026	0.830 m	0.507 m to 0.957 m	0.808 m
4 January 2026	0.829 m	0.517 m to 0.956 m	0.809 m
5 January 2026	0.826 m	0.532 m to 0.951 m	0.808 m
6 January 2026	0.825 m	0.536 m to 0.948 m	0.808 m
7 January 2026	0.828 m	0.544 m to 0.946 m	0.808 m
8 January 2026	0.841 m	0.545 m to 0.939 m	0.808 m
9 January 2026	0.856 m	0.545 m to 0.936 m	0.808 m
10 January 2026	0.848 m	0.546 m to 0.935 m	0.808 m
11 January 2026	0.843 m	0.544 m to 0.934 m	0.808 m
12 January 2026	0.835 m	0.541 m to 0.934 m	0.809 m
13 January 2026	0.833 m	0.541 m to 0.932 m	0.809 m
14 January 2026	0.833 m	0.534 m to 0.932 m	0.809 m
15 January 2026	0.831 m	0.534 m to 0.932 m	0.809 m
16 January 2026	0.834 m	0.541 m to 0.934 m	0.809 m
17 January 2026	0.857 m	0.551 m to 0.936 m	0.809 m
18 January 2026	0.839 m	0.552 m to 0.942 m	0.809 m
19 January 2026	0.832 m	0.551 m to 0.946 m	0.810 m
20 January 2026	0.830 m	0.551 m to 0.952 m	0.812 m
21 January 2026	0.833 m	0.551 m to 0.955 m	0.812 m
22 January 2026	0.834 m	0.551 m to 0.958 m	0.813 m
23 January 2026	0.835 m	0.551 m to 0.960 m	0.813 m
24 January 2026	0.834 m	0.559 m to 0.963 m	0.814 m
25 January 2026	0.833 m	0.560 m to 0.966 m	0.814 m
26 January 2026	0.831 m	0.561 m to 0.967 m	0.813 m
27 January 2026	0.840 m	0.571 m to 0.974 m	0.812 m
28 January 2026	0.899 m	0.574 m to 0.975 m	0.812 m
29 January 2026	0.866 m	0.577 m to 0.975 m	0.811 m
30 January 2026	0.853 m	0.584 m to 0.976 m	0.811 m
31 January 2026	0.852 m	0.588 m to 0.977 m	0.811 m
1 February 2026	0.849 m	0.580 m to 0.979 m	0.811 m
2 February 2026	0.871 m	0.575 m to 0.980 m	0.814 m
3 February 2026	0.890 m	0.575 m to 0.981 m	0.818 m
4 February 2026	0.930 m	0.575 m to 0.981 m	0.818 m
5 February 2026	0.933 m	0.575 m to 0.982 m	0.820 m
6 February 2026	0.922 m	0.575 m to 0.982 m	0.820 m
7 February 2026	0.886 m	0.576 m to 0.984 m	0.818 m
8 February 2026	0.882 m	0.578 m to 0.991 m	0.819 m
9 February 2026	0.864 m	0.580 m to 0.994 m	0.820 m
10 February 2026	0.909 m	0.578 m to 0.994 m	0.820 m
11 February 2026	0.904 m	0.576 m to 0.991 m	0.819 m
12 February 2026	0.931 m	0.572 m to 0.987 m	0.820 m
13 February 2026	0.967 m	0.570 m to 0.984 m	0.822 m
14 February 2026	0.981 m	0.569 m to 0.979 m	0.820 m
15 February 2026	1.051 m	0.566 m to 0.974 m	0.820 m
16 February 2026	1.057 m	0.559 m to 0.972 m	0.819 m
17 February 2026	1.026 m	0.559 m to 0.971 m	0.817 m
18 February 2026	1.002 m	0.563 m to 0.967 m	0.813 m
19 February 2026	1.025 m	0.563 m to 0.964 m	0.813 m
20 February 2026	1.076 m	0.559 m to 0.962 m	0.812 m
21 February 2026	1.125 m	0.555 m to 0.960 m	0.812 m
22 February 2026	1.110 m	0.555 m to 0.959 m	0.815 m
23 February 2026	1.016 m	0.553 m to 0.957 m	0.815 m
24 February 2026	0.962 m	0.553 m to 0.954 m	0.815 m
25 February 2026	0.934 m	0.553 m to 0.952 m	0.815 m
26 February 2026	0.915 m	0.555 m to 0.952 m	0.818 m
27 February 2026	0.896 m	0.555 m to 0.953 m	0.819 m
28 February 2026	0.882 m	0.555 m to 0.954 m	0.819 m
1 March 2026	0.871 m	0.555 m to 0.957 m	0.821 m
2 March 2026	0.860 m	0.555 m to 0.961 m	0.821 m
3 March 2026	0.858 m	0.555 m to 0.963 m	0.821 m
4 March 2026	0.898 m	0.552 m to 0.966 m	0.823 m
5 March 2026	0.852 m	0.543 m to 0.967 m	0.824 m
6 March 2026	0.861 m	0.534 m to 0.967 m	0.824 m
7 March 2026	0.860 m	0.532 m to 0.964 m	0.825 m
8 March 2026	0.856 m	0.532 m to 0.963 m	0.824 m
9 March 2026	0.862 m	0.532 m to 0.962 m	0.822 m
10 March 2026	0.854 m	0.532 m to 0.962 m	0.821 m
11 March 2026	0.860 m	0.532 m to 0.959 m	0.821 m
12 March 2026	0.854 m	0.525 m to 0.960 m	0.821 m
13 March 2026	0.880 m	0.525 m to 0.962 m	0.821 m
14 March 2026	0.917 m	0.525 m to 0.960 m	0.821 m
15 March 2026	0.924 m	0.538 m to 0.959 m	0.821 m
16 March 2026	0.920 m	0.538 m to 0.956 m	0.821 m
17 March 2026	0.899 m	0.546 m to 0.955 m	0.820 m
18 March 2026	0.878 m	0.548 m to 0.955 m	0.820 m
19 March 2026	0.868 m	0.551 m to 0.955 m	0.819 m
20 March 2026	0.860 m	0.552 m to 0.954 m	0.818 m
21 March 2026	0.856 m	0.551 m to 0.953 m	0.817 m
22 March 2026	0.855 m	0.551 m to 0.952 m	0.816 m
23 March 2026	0.855 m	0.551 m to 0.952 m	0.818 m
24 March 2026	0.849 m	0.551 m to 0.952 m	0.819 m
25 March 2026	0.907 m	0.551 m to 0.953 m	0.819 m
26 March 2026	0.843 m	0.551 m to 0.953 m	0.819 m
27 March 2026	0.836 m	0.552 m to 0.952 m	0.819 m
28 March 2026	0.843 m	0.552 m to 0.952 m	0.817 m
29 March 2026	0.850 m	0.551 m to 0.951 m	0.816 m
30 March 2026	0.840 m	0.551 m to 0.950 m	0.815 m
31 March 2026	0.902 m	0.547 m to 0.949 m	0.815 m
1 April 2026	0.856 m	0.543 m to 0.947 m	0.815 m
2 April 2026	0.850 m	0.539 m to 0.946 m	0.815 m
3 April 2026	0.839 m	0.539 m to 0.945 m	0.815 m
4 April 2026	0.839 m	0.535 m to 0.944 m	0.815 m
5 April 2026	0.835 m	0.535 m to 0.941 m	0.814 m
6 April 2026	0.833 m	0.535 m to 0.939 m	0.812 m
7 April 2026	0.833 m	0.529 m to 0.938 m	0.812 m
8 April 2026	0.831 m	0.535 m to 0.938 m	0.811 m
9 April 2026	0.832 m	0.529 m to 0.938 m	0.809 m
10 April 2026	0.831 m	0.524 m to 0.938 m	0.809 m
11 April 2026	0.830 m	0.520 m to 0.936 m	0.809 m
12 April 2026	0.834 m	0.519 m to 0.934 m	0.808 m
13 April 2026	0.834 m	0.519 m to 0.931 m	0.808 m
14 April 2026	0.831 m	0.513 m to 0.929 m	0.808 m
15 April 2026	0.826 m	0.513 m to 0.928 m	0.808 m
16 April 2026	0.821 m	0.512 m to 0.929 m	0.808 m
17 April 2026	0.817 m	0.509 m to 0.928 m	0.808 m
18 April 2026	0.817 m	0.508 m to 0.927 m	0.807 m
19 April 2026	0.818 m	0.506 m to 0.923 m	0.805 m
20 April 2026	0.818 m	0.506 m to 0.921 m	0.805 m
21 April 2026	0.827 m	0.505 m to 0.919 m	0.803 m
22 April 2026	0.819 m	0.500 m to 0.919 m	0.802 m
23 April 2026	0.810 m	0.499 m to 0.919 m	0.801 m
24 April 2026	0.813 m	0.471 m to 0.921 m	0.800 m
25 April 2026	0.806 m	0.458 m to 0.923 m	0.797 m
26 April 2026	0.804 m	0.452 m to 0.924 m	0.796 m
27 April 2026	0.806 m	0.446 m to 0.926 m	0.796 m
28 April 2026	0.803 m	0.443 m to 0.926 m	0.795 m
29 April 2026	0.822 m	0.443 m to 0.935 m	0.795 m
30 April 2026	0.807 m	0.429 m to 0.938 m	0.793 m
1 May 2026	0.800 m	0.426 m to 0.941 m	0.793 m
2 May 2026	0.792 m	0.425 m to 0.941 m	0.792 m
3 May 2026	0.798 m	0.422 m to 0.938 m	0.791 m
4 May 2026	0.808 m	0.419 m to 0.938 m	0.790 m
5 May 2026	0.847 m	0.418 m to 0.941 m	0.790 m
6 May 2026	0.889 m	0.418 m to 0.941 m	0.790 m
7 May 2026	0.884 m	0.418 m to 0.941 m	0.790 m
8 May 2026	0.854 m	0.419 m to 0.938 m	0.787 m
9 May 2026	0.887 m	0.416 m to 0.932 m	0.786 m
10 May 2026	0.838 m	0.413 m to 0.929 m	0.786 m
11 May 2026	0.829 m	0.413 m to 0.924 m	0.786 m
12 May 2026	0.921 m	0.411 m to 0.923 m	0.786 m
13 May 2026	0.833 m	0.406 m to 0.921 m	0.787 m
14 May 2026	0.824 m	0.397 m to 0.918 m	0.787 m
15 May 2026	0.821 m	0.397 m to 0.916 m	0.787 m
16 May 2026	0.821 m	0.394 m to 0.914 m	0.786 m
17 May 2026	0.821 m	0.388 m to 0.914 m	0.786 m
18 May 2026	0.848 m	0.391 m to 0.915 m	0.785 m
19 May 2026	0.843 m	0.396 m to 0.915 m	0.783 m
20 May 2026	0.833 m	0.395 m to 0.912 m	0.783 m
21 May 2026	0.825 m	0.398 m to 0.910 m	0.783 m
22 May 2026	0.818 m	0.398 m to 0.910 m	0.784 m
23 May 2026	0.811 m	0.394 m to 0.910 m	0.783 m
24 May 2026	0.810 m	0.391 m to 0.911 m	0.783 m
25 May 2026	0.803 m	0.391 m to 0.911 m	0.783 m
26 May 2026	0.808 m	0.393 m to 0.911 m	0.782 m
27 May 2026	0.801 m	0.394 m to 0.910 m	0.781 m
28 May 2026	0.802 m	0.398 m to 0.907 m	0.781 m
29 May 2026	0.801 m	0.398 m to 0.906 m	0.779 m
30 May 2026	0.792 m	0.399 m to 0.905 m	0.778 m
31 May 2026	0.787 m	0.400 m to 0.904 m	0.776 m
1 June 2026	0.817 m	0.400 m to 0.903 m	0.776 m
2 June 2026	0.793 m	0.398 m to 0.902 m	0.773 m
3 June 2026	0.795 m	0.398 m to 0.901 m	0.772 m
4 June 2026	0.796 m	0.402 m to 0.900 m	0.770 m
5 June 2026	0.801 m	0.402 m to 0.900 m	0.768 m
6 June 2026	0.796 m	0.407 m to 0.898 m	0.766 m
7 June 2026	0.794 m	0.407 m to 0.897 m	0.763 m
8 June 2026	0.791 m	0.411 m to 0.895 m	0.763 m
9 June 2026	0.790 m	0.417 m to 0.893 m	0.762 m
10 June 2026	0.791 m	0.417 m to 0.893 m	0.762 m
11 June 2026	0.797 m	0.416 m to 0.893 m	0.762 m
12 June 2026	0.785 m	0.407 m to 0.892 m	0.763 m
13 June 2026	0.783 m	0.400 m to 0.892 m	0.762 m
14 June 2026	0.783 m	0.390 m to 0.891 m	0.762 m
15 June 2026	0.784 m	0.390 m to 0.892 m	0.762 m
16 June 2026	0.807 m	0.390 m to 0.892 m	0.762 m
17 June 2026	0.809 m	0.390 m to 0.891 m	0.762 m
18 June 2026	0.812 m	0.390 m to 0.889 m	0.762 m
19 June 2026	0.770 m	0.381 m to 0.886 m	0.761 m
20 June 2026	0.772 m	0.378 m to 0.884 m	0.759 m
21 June 2026	0.768 m	0.373 m to 0.881 m	0.759 m
22 June 2026	0.761 m	0.367 m to 0.876 m	0.758 m
23 June 2026	0.813 m	0.364 m to 0.874 m	0.758 m
24 June 2026	0.806 m	0.364 m to 0.869 m	0.757 m
25 June 2026	0.775 m	0.369 m to 0.868 m	0.757 m
26 June 2026	0.755 m	0.376 m to 0.868 m	0.754 m
27 June 2026	0.751 m	0.376 m to 0.868 m	0.753 m
28 June 2026	0.755 m	0.379 m to 0.867 m	0.753 m
29 June 2026	0.747 m	0.379 m to 0.865 m	0.753 m
30 June 2026	0.789 m	0.380 m to 0.863 m	0.752 m
1 July 2026	0.754 m	0.380 m to 0.861 m	0.751 m
2 July 2026	0.748 m	0.372 m to 0.860 m	0.750 m
3 July 2026	0.752 m	0.367 m to 0.859 m	0.750 m
4 July 2026	0.747 m	0.363 m to 0.858 m	0.750 m
5 July 2026	0.764 m	0.363 m to 0.857 m	0.749 m
6 July 2026	0.752 m	0.361 m to 0.857 m	0.750 m
7 July 2026	0.745 m	0.360 m to 0.857 m	0.749 m
8 July 2026	0.742 m	0.358 m to 0.856 m	0.749 m
9 July 2026	0.790 m	0.358 m to 0.856 m	0.748 m
10 July 2026	0.795 m	0.356 m to 0.856 m	0.748 m
11 July 2026	0.772 m	0.352 m to 0.855 m	0.747 m
12 July 2026	0.756 m	0.347 m to 0.855 m	0.747 m
13 July 2026	0.737 m	0.339 m to 0.854 m	0.744 m
14 July 2026	0.737 m	0.334 m to 0.853 m	0.743 m
15 July 2026	0.733 m	0.331 m to 0.851 m	0.741 m
16 July 2026	0.758 m	0.326 m to 0.846 m	0.740 m
17 July 2026	0.750 m	0.324 m to 0.845 m	0.740 m
18 July 2026	0.745 m	0.320 m to 0.845 m	0.739 m
19 July 2026	0.747 m	0.320 m to 0.845 m	0.737 m
20 July 2026	0.737 m	0.314 m to 0.844 m	0.737 m
21 July 2026	0.731 m	0.314 m to 0.843 m	0.735 m
22 July 2026	0.730 m	0.314 m to 0.843 m	0.734 m
23 July 2026	0.730 m	0.303 m to 0.842 m	0.733 m
24 July 2026	0.729 m	0.285 m to 0.841 m	0.733 m
25 July 2026	0.728 m	0.273 m to 0.840 m	0.733 m
26 July 2026	0.728 m	0.269 m to 0.838 m	0.733 m
27 July 2026	0.729 m	0.252 m to 0.837 m	0.733 m
28 July 2026	0.726 m	0.247 m to 0.838 m	0.733 m
29 July 2026	0.725 m	0.239 m to 0.837 m	0.733 m
30 July 2026	0.725 m	0.239 m to 0.837 m	0.731 m
31 July 2026	0.724 m	0.237 m to 0.837 m	0.731 m
1 August 2026	0.725 m	0.235 m to 0.835 m	0.731 m
2 August 2026	0.724 m	0.234 m to 0.835 m	0.730 m
3 August 2026	0.721 m	0.230 m to 0.834 m	0.729 m
4 August 2026	0.721 m	0.228 m to 0.834 m	0.729 m
5 August 2026	0.721 m	0.220 m to 0.832 m	0.729 m
6 August 2026	0.722 m	0.215 m to 0.832 m	0.728 m
7 August 2026	0.719 m	0.214 m to 0.829 m	0.727 m
8 August 2026	0.718 m	0.208 m to 0.827 m	0.727 m
9 August 2026	0.718 m	0.208 m to 0.824 m	0.727 m
10 August 2026	0.716 m	0.214 m to 0.823 m	0.727 m
11 August 2026	0.717 m	0.218 m to 0.822 m	0.727 m
12 August 2026	0.717 m	0.218 m to 0.822 m	0.727 m
13 August 2026	0.715 m	0.218 m to 0.821 m	0.727 m
14 August 2026	0.716 m	0.218 m to 0.818 m	0.727 m
15 August 2026	0.713 m	0.208 m to 0.822 m	0.727 m
16 August 2026	0.718 m	0.207 m to 0.822 m	0.726 m
17 August 2026	0.722 m	0.205 m to 0.823 m	0.726 m
18 August 2026	0.722 m	0.207 m to 0.823 m	0.726 m
19 August 2026	0.716 m	0.208 m to 0.823 m	0.726 m
20 August 2026	0.724 m	0.210 m to 0.823 m	0.726 m
21 August 2026	0.727 m	0.210 m to 0.824 m	0.727 m
22 August 2026	0.727 m	0.213 m to 0.825 m	0.728 m
23 August 2026	0.724 m	0.215 m to 0.825 m	0.728 m
24 August 2026	0.733 m	0.219 m to 0.828 m	0.730 m
25 August 2026	0.727 m	0.219 m to 0.829 m	0.731 m
26 August 2026	0.730 m	0.220 m to 0.829 m	0.732 m
27 August 2026	0.736 m	0.224 m to 0.830 m	0.733 m
28 August 2026	0.764 m	0.225 m to 0.830 m	0.733 m
29 August 2026	0.745 m	0.226 m to 0.827 m	0.733 m
30 August 2026	0.740 m	0.229 m to 0.826 m	0.732 m
31 August 2026	0.743 m	0.231 m to 0.824 m	0.732 m
1 September 2026	0.744 m	0.232 m to 0.823 m	0.733 m
2 September 2026	0.737 m	0.235 m to 0.826 m	0.733 m
3 September 2026	0.739 m	0.236 m to 0.826 m	0.733 m
4 September 2026	0.736 m	0.239 m to 0.827 m	0.733 m
5 September 2026	0.741 m	0.239 m to 0.827 m	0.733 m
6 September 2026	0.740 m	0.245 m to 0.827 m	0.733 m
7 September 2026	0.735 m	0.250 m to 0.828 m	0.733 m
8 September 2026	0.741 m	0.251 m to 0.830 m	0.733 m
9 September 2026	0.746 m	0.263 m to 0.834 m	0.733 m
10 September 2026	0.739 m	0.275 m to 0.837 m	0.734 m
11 September 2026	0.738 m	0.276 m to 0.838 m	0.734 m
12 September 2026	0.736 m	0.276 m to 0.840 m	0.734 m
13 September 2026	0.734 m	0.287 m to 0.844 m	0.735 m
14 September 2026	0.737 m	0.294 m to 0.848 m	0.736 m
15 September 2026	0.735 m	0.302 m to 0.850 m	0.736 m
16 September 2026	0.736 m	0.307 m to 0.851 m	0.736 m
17 September 2026	0.744 m	0.310 m to 0.851 m	0.736 m
18 September 2026	0.737 m	0.310 m to 0.851 m	0.736 m
19 September 2026	0.735 m	0.310 m to 0.851 m	0.738 m
20 September 2026	0.734 m	0.311 m to 0.852 m	0.741 m
21 September 2026	0.732 m	0.316 m to 0.853 m	0.742 m
22 September 2026	0.731 m	0.320 m to 0.854 m	0.742 m
23 September 2026	0.732 m	0.322 m to 0.856 m	0.743 m
24 September 2026	0.743 m	0.325 m to 0.857 m	0.743 m
25 September 2026	0.737 m	0.324 m to 0.856 m	0.743 m
26 September 2026	0.734 m	0.329 m to 0.856 m	0.745 m
27 September 2026	0.735 m	0.332 m to 0.856 m	0.746 m
28 September 2026	0.737 m	0.332 m to 0.856 m	0.747 m
29 September 2026	0.740 m	0.329 m to 0.855 m	0.748 m
30 September 2026	0.753 m	0.330 m to 0.853 m	0.748 m
1 October 2026	0.750 m	0.330 m to 0.856 m	0.748 m
2 October 2026	0.748 m	0.330 m to 0.856 m	0.749 m
3 October 2026	0.744 m	0.329 m to 0.857 m	0.749 m
4 October 2026	0.742 m	0.332 m to 0.857 m	0.751 m
5 October 2026	0.743 m	0.337 m to 0.857 m	0.752 m
6 October 2026	0.743 m	0.337 m to 0.857 m	0.753 m
7 October 2026	0.753 m	0.337 m to 0.857 m	0.754 m
8 October 2026	0.779 m	0.341 m to 0.857 m	0.753 m
9 October 2026	0.764 m	0.341 m to 0.857 m	0.755 m
10 October 2026	0.757 m	0.341 m to 0.862 m	0.755 m
11 October 2026	0.757 m	0.342 m to 0.864 m	0.756 m
12 October 2026	0.755 m	0.342 m to 0.868 m	0.757 m
13 October 2026	0.751 m	0.342 m to 0.870 m	0.757 m
14 October 2026	0.753 m	0.347 m to 0.872 m	0.758 m
15 October 2026	0.753 m	0.350 m to 0.872 m	0.758 m
16 October 2026	0.756 m	0.350 m to 0.872 m	0.758 m
17 October 2026	0.755 m	0.351 m to 0.872 m	0.758 m
18 October 2026	0.756 m	0.351 m to 0.872 m	0.759 m
19 October 2026	0.758 m	0.352 m to 0.872 m	0.761 m
20 October 2026	0.758 m	0.361 m to 0.871 m	0.762 m
21 October 2026	0.763 m	0.366 m to 0.872 m	0.764 m
22 October 2026	0.777 m	0.370 m to 0.872 m	0.766 m
23 October 2026	0.778 m	0.380 m to 0.871 m	0.768 m
24 October 2026	0.769 m	0.384 m to 0.869 m	0.768 m
25 October 2026	0.779 m	0.404 m to 0.868 m	0.769 m

The last 10 years, weekly averages

Level

Weekly averages of the Essonne at Boulancourt from the week of 24 October 2016 to 25 October 2026.

Table: The last 10 years, weekly averages

Week starting	Weekly average of daily highs (m)
24 October 2016	0.874 m
31 October 2016	0.869 m
7 November 2016	0.892 m
14 November 2016	0.896 m
21 November 2016	0.897 m
28 November 2016	0.884 m
5 December 2016	0.878 m
12 December 2016	0.876 m
19 December 2016	0.879 m
26 December 2016	0.865 m
2 January 2017	0.866 m
9 January 2017	0.895 m
16 January 2017	0.900 m
23 January 2017	0.846 m
30 January 2017	0.856 m
6 February 2017	0.870 m
13 February 2017	0.844 m
20 February 2017	0.839 m
27 February 2017	0.873 m
6 March 2017	0.970 m
13 March 2017	0.865 m
20 March 2017	0.827 m
27 March 2017	0.806 m
3 April 2017	0.808 m
10 April 2017	0.818 m
17 April 2017	0.798 m
24 April 2017	0.797 m
1 May 2017	0.816 m
8 May 2017	0.805 m
15 May 2017	0.797 m
22 May 2017	0.796 m
29 May 2017	0.796 m
5 June 2017	0.797 m
12 June 2017	0.793 m
19 June 2017	0.770 m
26 June 2017	0.791 m
3 July 2017	0.779 m
10 July 2017	0.782 m
17 July 2017	0.765 m
24 July 2017	0.781 m
31 July 2017	0.767 m
7 August 2017	0.770 m
14 August 2017	0.799 m
21 August 2017	0.779 m
28 August 2017	0.788 m
4 September 2017	0.792 m
11 September 2017	0.824 m
18 September 2017	0.801 m
25 September 2017	0.802 m
2 October 2017	0.798 m
9 October 2017	0.796 m
16 October 2017	0.797 m
23 October 2017	0.817 m
30 October 2017	0.816 m
6 November 2017	0.832 m
13 November 2017	0.844 m
20 November 2017	0.823 m
27 November 2017	0.815 m
4 December 2017	0.804 m
11 December 2017	0.849 m
18 December 2017	0.822 m
25 December 2017	0.823 m
1 January 2018	0.874 m
8 January 2018	0.862 m
15 January 2018	0.889 m
22 January 2018	0.978 m
29 January 2018	0.927 m
5 February 2018	0.907 m
12 February 2018	0.980 m
19 February 2018	0.949 m
26 February 2018	0.883 m
5 March 2018	0.929 m
12 March 2018	0.951 m
19 March 2018	0.900 m
26 March 2018	0.887 m
2 April 2018	0.894 m
9 April 2018	0.916 m
16 April 2018	0.879 m
23 April 2018	0.859 m
30 April 2018	0.880 m
7 May 2018	0.847 m
14 May 2018	0.854 m
21 May 2018	0.846 m
28 May 2018	0.851 m
4 June 2018	0.874 m
11 June 2018	0.914 m
18 June 2018	0.847 m
25 June 2018	0.824 m
2 July 2018	0.829 m
9 July 2018	0.809 m
16 July 2018	0.809 m
23 July 2018	0.791 m
30 July 2018	0.773 m
6 August 2018	0.772 m
13 August 2018	0.765 m
20 August 2018	0.764 m
27 August 2018	0.776 m
3 September 2018	0.776 m
10 September 2018	0.786 m
17 September 2018	0.780 m
24 September 2018	0.791 m
1 October 2018	0.784 m
8 October 2018	0.792 m
15 October 2018	0.805 m
22 October 2018	0.806 m
29 October 2018	0.819 m
5 November 2018	0.811 m
12 November 2018	0.816 m
19 November 2018	0.823 m
26 November 2018	0.839 m
3 December 2018	0.841 m
10 December 2018	0.821 m
17 December 2018	0.829 m
24 December 2018	0.818 m
31 December 2018	0.808 m
7 January 2019	0.808 m
14 January 2019	0.811 m
21 January 2019	0.821 m
28 January 2019	0.857 m
4 February 2019	0.839 m
11 February 2019	0.841 m
18 February 2019	0.822 m
25 February 2019	0.820 m
4 March 2019	0.856 m
11 March 2019	0.840 m
18 March 2019	0.829 m
25 March 2019	0.822 m
1 April 2019	0.824 m
8 April 2019	0.805 m
15 April 2019	0.791 m
22 April 2019	0.784 m
29 April 2019	0.783 m
6 May 2019	0.802 m
13 May 2019	0.784 m
20 May 2019	0.779 m
27 May 2019	0.776 m
3 June 2019	0.792 m
10 June 2019	0.812 m
17 June 2019	0.790 m
24 June 2019	0.764 m
1 July 2019	0.746 m
8 July 2019	0.731 m
15 July 2019	0.730 m
22 July 2019	0.723 m
29 July 2019	0.720 m
5 August 2019	0.719 m
12 August 2019	0.749 m
19 August 2019	0.746 m
26 August 2019	0.736 m
2 September 2019	0.739 m
9 September 2019	0.738 m
16 September 2019	0.739 m
23 September 2019	0.753 m
30 September 2019	0.760 m
7 October 2019	0.767 m
14 October 2019	0.781 m
21 October 2019	0.777 m
28 October 2019	0.788 m
4 November 2019	0.800 m
11 November 2019	0.812 m
18 November 2019	0.794 m
25 November 2019	0.810 m
2 December 2019	0.803 m
9 December 2019	0.854 m
16 December 2019	0.879 m
23 December 2019	0.857 m
30 December 2019	0.822 m
6 January 2020	0.810 m
13 January 2020	0.805 m
20 January 2020	0.798 m
27 January 2020	0.814 m
3 February 2020	0.877 m
10 February 2020	0.843 m
17 February 2020	0.862 m
24 February 2020	0.867 m
2 March 2020	1.036 m
9 March 2020	0.951 m
16 March 2020	0.854 m
23 March 2020	0.834 m
30 March 2020	0.825 m
6 April 2020	0.812 m
13 April 2020	0.795 m
20 April 2020	0.777 m
27 April 2020	0.791 m
4 May 2020	0.802 m
11 May 2020	0.947 m
18 May 2020	0.825 m
25 May 2020	0.805 m
1 June 2020	0.821 m
8 June 2020	0.810 m
15 June 2020	0.808 m
22 June 2020	0.790 m
29 June 2020	0.778 m
6 July 2020	0.768 m
13 July 2020	0.763 m
20 July 2020	0.749 m
27 July 2020	0.740 m
3 August 2020	0.733 m
10 August 2020	0.736 m
17 August 2020	0.745 m
24 August 2020	0.747 m
31 August 2020	0.755 m
7 September 2020	0.758 m
14 September 2020	0.759 m
21 September 2020	0.769 m
28 September 2020	0.791 m
5 October 2020	0.791 m
12 October 2020	0.786 m
19 October 2020	0.796 m
26 October 2020	0.795 m
2 November 2020	0.796 m
9 November 2020	0.791 m
16 November 2020	0.790 m
23 November 2020	0.788 m
30 November 2020	0.794 m
7 December 2020	0.799 m
14 December 2020	0.801 m
21 December 2020	0.815 m
28 December 2020	0.841 m
4 January 2021	0.808 m
11 January 2021	0.806 m
18 January 2021	0.864 m
25 January 2021	0.878 m
1 February 2021	0.930 m
8 February 2021	0.903 m
15 February 2021	0.859 m
22 February 2021	0.841 m
1 March 2021	0.831 m
8 March 2021	0.827 m
15 March 2021	0.830 m
22 March 2021	0.822 m
29 March 2021	0.817 m
5 April 2021	0.813 m
12 April 2021	0.810 m
19 April 2021	0.799 m
26 April 2021	0.781 m
3 May 2021	0.802 m
10 May 2021	0.808 m
17 May 2021	0.813 m
24 May 2021	0.809 m
31 May 2021	0.803 m
7 June 2021	0.790 m
14 June 2021	0.789 m
21 June 2021	0.789 m
28 June 2021	0.795 m
5 July 2021	0.793 m
12 July 2021	0.827 m
19 July 2021	0.785 m
26 July 2021	0.784 m
2 August 2021	0.785 m
9 August 2021	0.776 m
16 August 2021	0.766 m
23 August 2021	0.761 m
30 August 2021	0.757 m
6 September 2021	0.762 m
13 September 2021	0.813 m
20 September 2021	0.839 m
27 September 2021	0.787 m
4 October 2021	0.794 m
11 October 2021	0.788 m
18 October 2021	0.804 m
25 October 2021	0.808 m
1 November 2021	0.826 m
8 November 2021	0.802 m
15 November 2021	0.796 m
22 November 2021	0.805 m
29 November 2021	0.820 m
6 December 2021	0.858 m
13 December 2021	0.828 m
20 December 2021	0.808 m
27 December 2021	0.842 m
3 January 2022	0.870 m
10 January 2022	0.891 m
17 January 2022	0.831 m
24 January 2022	0.822 m
31 January 2022	0.822 m
7 February 2022	0.822 m
14 February 2022	0.839 m
21 February 2022	0.829 m
28 February 2022	0.824 m
7 March 2022	0.822 m
14 March 2022	0.819 m
21 March 2022	0.815 m
28 March 2022	0.817 m
4 April 2022	0.831 m
11 April 2022	0.828 m
18 April 2022	0.810 m
25 April 2022	0.801 m
2 May 2022	0.784 m
9 May 2022	0.765 m
16 May 2022	0.766 m
23 May 2022	0.761 m
30 May 2022	0.756 m
6 June 2022	0.772 m
13 June 2022	0.753 m
20 June 2022	0.771 m
27 June 2022	0.769 m
4 July 2022	0.758 m
11 July 2022	0.741 m
18 July 2022	0.747 m
25 July 2022	0.739 m
1 August 2022	0.720 m
8 August 2022	0.722 m
15 August 2022	0.725 m
22 August 2022	0.721 m
29 August 2022	0.725 m
5 September 2022	0.737 m
12 September 2022	0.738 m
19 September 2022	0.738 m
26 September 2022	0.756 m
3 October 2022	0.747 m
10 October 2022	0.755 m
17 October 2022	0.806 m
24 October 2022	0.771 m
31 October 2022	0.769 m
7 November 2022	0.769 m
14 November 2022	0.778 m
21 November 2022	0.776 m
28 November 2022	0.784 m
5 December 2022	0.774 m
12 December 2022	0.775 m
19 December 2022	0.789 m
26 December 2022	0.792 m
2 January 2023	0.794 m
9 January 2023	0.798 m
16 January 2023	0.909 m
23 January 2023	0.806 m
30 January 2023	0.785 m
6 February 2023	0.782 m
13 February 2023	0.785 m
20 February 2023	0.781 m
27 February 2023	0.774 m
6 March 2023	0.786 m
13 March 2023	0.803 m
20 March 2023	0.799 m
27 March 2023	0.803 m
3 April 2023	0.805 m
10 April 2023	0.796 m
17 April 2023	0.794 m
24 April 2023	0.775 m
1 May 2023	0.759 m
8 May 2023	0.774 m
15 May 2023	0.773 m
22 May 2023	0.759 m
29 May 2023	0.751 m
5 June 2023	0.746 m
12 June 2023	0.735 m
19 June 2023	0.745 m
26 June 2023	0.735 m
3 July 2023	0.726 m
10 July 2023	0.717 m
17 July 2023	0.709 m
24 July 2023	0.734 m
31 July 2023	0.748 m
7 August 2023	0.733 m
14 August 2023	0.733 m
21 August 2023	0.733 m
28 August 2023	0.734 m
4 September 2023	0.724 m
11 September 2023	0.734 m
18 September 2023	0.751 m
25 September 2023	0.742 m
2 October 2023	0.744 m
9 October 2023	0.744 m
16 October 2023	0.762 m
23 October 2023	0.797 m
30 October 2023	0.797 m
6 November 2023	0.794 m
13 November 2023	0.797 m
20 November 2023	0.782 m
27 November 2023	0.782 m
4 December 2023	0.798 m
11 December 2023	0.863 m
18 December 2023	0.811 m
25 December 2023	0.788 m
1 January 2024	0.812 m
8 January 2024	0.791 m
15 January 2024	0.849 m
22 January 2024	0.839 m
29 January 2024	0.810 m
5 February 2024	0.816 m
12 February 2024	0.814 m
19 February 2024	0.889 m
26 February 2024	0.927 m
4 March 2024	0.908 m
11 March 2024	0.876 m
18 March 2024	0.889 m
25 March 2024	0.885 m
1 April 2024	0.964 m
8 April 2024	0.854 m
15 April 2024	0.846 m
22 April 2024	0.849 m
29 April 2024	0.875 m
6 May 2024	0.898 m
13 May 2024	0.840 m
20 May 2024	0.835 m
27 May 2024	0.823 m
3 June 2024	0.837 m
10 June 2024	0.816 m
17 June 2024	0.882 m
24 June 2024	0.911 m
1 July 2024	0.819 m
8 July 2024	0.825 m
15 July 2024	0.804 m
22 July 2024	0.813 m
29 July 2024	0.814 m
5 August 2024	0.790 m
12 August 2024	0.778 m
19 August 2024	0.787 m
26 August 2024	0.790 m
2 September 2024	0.798 m
9 September 2024	0.805 m
16 September 2024	0.798 m
23 September 2024	0.850 m
30 September 2024	0.844 m
7 October 2024	0.987 m
14 October 2024	0.902 m
21 October 2024	0.838 m
28 October 2024	0.842 m
4 November 2024	0.835 m
11 November 2024	0.823 m
18 November 2024	0.895 m
25 November 2024	0.931 m
2 December 2024	0.896 m
9 December 2024	0.907 m
16 December 2024	0.879 m
23 December 2024	0.890 m
30 December 2024	0.923 m
6 January 2025	1.024 m
13 January 2025	0.927 m
20 January 2025	0.944 m
27 January 2025	1.044 m
3 February 2025	0.947 m
10 February 2025	0.914 m
17 February 2025	0.900 m
24 February 2025	1.005 m
3 March 2025	0.939 m
10 March 2025	0.921 m
17 March 2025	0.908 m
24 March 2025	0.933 m
31 March 2025	0.921 m
7 April 2025	0.931 m
14 April 2025	0.929 m
21 April 2025	0.925 m
28 April 2025	0.891 m
5 May 2025	0.926 m
12 May 2025	0.884 m
19 May 2025	0.878 m
26 May 2025	0.871 m
2 June 2025	0.859 m
9 June 2025	0.846 m
16 June 2025	0.836 m
23 June 2025	0.829 m
30 June 2025	0.811 m
7 July 2025	0.818 m
14 July 2025	0.809 m
21 July 2025	0.844 m
28 July 2025	0.835 m
4 August 2025	0.816 m
11 August 2025	0.793 m
18 August 2025	0.815 m
25 August 2025	0.800 m
1 September 2025	0.834 m
8 September 2025	0.841 m
15 September 2025	0.841 m
22 September 2025	0.860 m
29 September 2025	0.845 m
6 October 2025	0.840 m
13 October 2025	0.830 m
20 October 2025	0.839 m
27 October 2025	0.850 m
3 November 2025	0.843 m
10 November 2025	0.839 m
17 November 2025	0.839 m
24 November 2025	0.855 m
1 December 2025	0.853 m
8 December 2025	0.854 m
15 December 2025	0.846 m
22 December 2025	0.858 m
29 December 2025	0.830 m
5 January 2026	0.838 m
12 January 2026	0.837 m
19 January 2026	0.833 m
26 January 2026	0.856 m
2 February 2026	0.902 m
9 February 2026	0.944 m
16 February 2026	1.060 m
23 February 2026	0.925 m
2 March 2026	0.864 m
9 March 2026	0.879 m
16 March 2026	0.877 m
23 March 2026	0.855 m
30 March 2026	0.852 m
6 April 2026	0.832 m
13 April 2026	0.823 m
20 April 2026	0.814 m
27 April 2026	0.804 m
4 May 2026	0.858 m
11 May 2026	0.839 m
18 May 2026	0.827 m
25 May 2026	0.799 m
1 June 2026	0.799 m
8 June 2026	0.789 m
15 June 2026	0.789 m
22 June 2026	0.774 m
29 June 2026	0.757 m
6 July 2026	0.765 m
13 July 2026	0.744 m
20 July 2026	0.730 m
27 July 2026	0.725 m
3 August 2026	0.720 m
10 August 2026	0.716 m
17 August 2026	0.723 m
24 August 2026	0.739 m
31 August 2026	0.740 m
7 September 2026	0.738 m
14 September 2026	0.737 m
21 September 2026	0.735 m
28 September 2026	0.745 m
5 October 2026	0.757 m
12 October 2026	0.754 m
19 October 2026	0.769 m

The whole record since 1985, monthly averages

Level
Our record

Monthly averages of the Essonne at Boulancourt from 24 August 1985 to 25 October 2026.

Table: The whole record since 1985, monthly averages

Month starting	Monthly average of daily highs (m)
1 August 1985	no value
1 September 1985	0.622 m
1 October 1985	0.635 m
1 November 1985	0.645 m
1 December 1985	0.683 m
1 January 1986	0.683 m
1 February 1986	0.644 m
1 March 1986	0.719 m
1 April 1986	0.758 m
1 May 1986	0.760 m
1 June 1986	no value
1 July 1986	0.524 m
1 August 1986	no value
1 September 1986	0.620 m
1 October 1986	0.670 m
1 November 1986	0.710 m
1 December 1986	0.721 m
1 January 1987	0.676 m
1 February 1987	0.744 m
1 March 1987	0.690 m
1 April 1987	no value
1 May 1987	0.675 m
1 June 1987	0.687 m
1 July 1987	0.691 m
1 August 1987	0.677 m
1 September 1987	0.642 m
1 October 1987	0.706 m
1 November 1987	0.755 m
1 December 1987	0.769 m
1 January 1988	0.935 m
1 February 1988	0.972 m
1 March 1988	0.821 m
1 April 1988	0.792 m
1 May 1988	0.805 m
1 June 1988	0.696 m
1 July 1988	0.734 m
1 August 1988	0.680 m
1 September 1988	0.715 m
1 October 1988	0.747 m
1 November 1988	0.745 m
1 December 1988	0.759 m
1 January 1989	0.714 m
1 February 1989	0.728 m
1 March 1989	0.767 m
1 April 1989	0.766 m
1 May 1989	0.673 m
1 June 1989	0.554 m
1 July 1989	0.560 m
1 August 1989	0.466 m
1 September 1989	0.503 m
1 October 1989	0.547 m
1 November 1989	0.605 m
1 December 1989	0.589 m
1 January 1990	0.577 m
1 February 1990	0.627 m
1 March 1990	0.585 m
1 April 1990	0.556 m
1 May 1990	0.440 m
1 June 1990	0.430 m
1 July 1990	no value
1 August 1990	0.224 m
1 September 1990	0.271 m
1 October 1990	0.361 m
1 November 1990	0.415 m
1 December 1990	0.438 m
1 January 1991	0.492 m
1 February 1991	0.454 m
1 March 1991	0.494 m
1 April 1991	0.415 m
1 May 1991	0.361 m
1 June 1991	0.296 m
1 July 1991	0.305 m
1 August 1991	0.260 m
1 September 1991	0.226 m
1 October 1991	0.303 m
1 November 1991	0.392 m
1 December 1991	no value
1 January 1992	0.400 m
1 February 1992	0.412 m
1 March 1992	0.408 m
1 April 1992	0.432 m
1 May 1992	0.234 m
1 June 1992	0.172 m
1 July 1992	0.184 m
1 August 1992	0.169 m
1 September 1992	0.185 m
1 October 1992	0.167 m
1 November 1992	0.231 m
1 December 1992	0.319 m
1 January 1993	0.593 m
1 February 1993	0.681 m
1 March 1993	0.675 m
1 April 1993	0.655 m
1 May 1993	0.688 m
1 June 1993	0.545 m
1 July 1993	0.313 m
1 August 1993	0.163 m
1 September 1993	0.217 m
1 October 1993	0.178 m
1 November 1993	0.229 m
1 December 1993	0.379 m
1 January 1994	0.479 m
1 February 1994	0.532 m
1 March 1994	0.459 m
1 April 1994	0.501 m
1 May 1994	0.382 m
1 June 1994	0.363 m
1 July 1994	0.244 m
1 August 1994	0.193 m
1 September 1994	0.302 m
1 October 1994	0.380 m
1 November 1994	0.441 m
1 December 1994	0.441 m
1 January 1995	0.601 m
1 February 1995	0.592 m
1 March 1995	0.704 m
1 April 1995	0.584 m
1 May 1995	0.579 m
1 June 1995	0.502 m
1 July 1995	0.394 m
1 August 1995	0.395 m
1 September 1995	0.476 m
1 October 1995	0.483 m
1 November 1995	0.509 m
1 December 1995	0.515 m
1 January 1996	0.574 m
1 February 1996	0.551 m
1 March 1996	0.502 m
1 April 1996	0.421 m
1 May 1996	0.374 m
1 June 1996	0.355 m
1 July 1996	0.295 m
1 August 1996	0.184 m
1 September 1996	0.628 m
1 October 1996	0.666 m
1 November 1996	0.706 m
1 December 1996	0.727 m
1 January 1997	0.702 m
1 February 1997	0.775 m
1 March 1997	0.752 m
1 April 1997	0.700 m
1 May 1997	0.694 m
1 June 1997	0.690 m
1 July 1997	0.700 m
1 August 1997	0.663 m
1 September 1997	0.676 m
1 October 1997	0.711 m
1 November 1997	0.740 m
1 December 1997	0.758 m
1 January 1998	0.777 m
1 February 1998	0.730 m
1 March 1998	0.747 m
1 April 1998	0.819 m
1 May 1998	0.735 m
1 June 1998	0.727 m
1 July 1998	0.699 m
1 August 1998	0.670 m
1 September 1998	0.710 m
1 October 1998	0.750 m
1 November 1998	0.752 m
1 December 1998	0.756 m
1 January 1999	0.793 m
1 February 1999	0.812 m
1 March 1999	0.839 m
1 April 1999	0.840 m
1 May 1999	0.805 m
1 June 1999	0.776 m
1 July 1999	0.735 m
1 August 1999	0.710 m
1 September 1999	0.767 m
1 October 1999	0.794 m
1 November 1999	0.809 m
1 December 1999	0.884 m
1 January 2000	0.873 m
1 February 2000	0.871 m
1 March 2000	0.874 m
1 April 2000	0.950 m
1 May 2000	0.893 m
1 June 2000	0.848 m
1 July 2000	0.836 m
1 August 2000	0.820 m
1 September 2000	0.831 m
1 October 2000	0.867 m
1 November 2000	0.901 m
1 December 2000	0.926 m
1 January 2001	0.939 m
1 February 2001	0.965 m
1 March 2001	1.084 m
1 April 2001	1.009 m
1 May 2001	0.993 m
1 June 2001	0.883 m
1 July 2001	0.936 m
1 August 2001	0.892 m
1 September 2001	0.906 m
1 October 2001	0.953 m
1 November 2001	0.915 m
1 December 2001	0.954 m
1 January 2002	0.977 m
1 February 2002	1.049 m
1 March 2002	1.017 m
1 April 2002	0.924 m
1 May 2002	0.892 m
1 June 2002	0.898 m
1 July 2002	0.855 m
1 August 2002	0.851 m
1 September 2002	0.864 m
1 October 2002	0.873 m
1 November 2002	0.944 m
1 December 2002	0.946 m
1 January 2003	0.999 m
1 February 2003	0.995 m
1 March 2003	0.955 m
1 April 2003	0.916 m
1 May 2003	0.946 m
1 June 2003	0.903 m
1 July 2003	0.836 m
1 August 2003	0.796 m
1 September 2003	0.815 m
1 October 2003	0.838 m
1 November 2003	0.854 m
1 December 2003	0.859 m
1 January 2004	0.946 m
1 February 2004	0.869 m
1 March 2004	0.848 m
1 April 2004	0.841 m
1 May 2004	0.842 m
1 June 2004	0.779 m
1 July 2004	0.764 m
1 August 2004	0.771 m
1 September 2004	0.783 m
1 October 2004	no value
1 November 2004	no value
1 December 2004	0.830 m
1 January 2005	0.850 m
1 February 2005	no value
1 March 2005	no value
1 April 2005	0.823 m
1 May 2005	0.809 m
1 June 2005	0.750 m
1 July 2005	0.757 m
1 August 2005	0.736 m
1 September 2005	0.754 m
1 October 2005	0.772 m
1 November 2005	0.788 m
1 December 2005	0.800 m
1 January 2006	0.794 m
1 February 2006	0.804 m
1 March 2006	0.825 m
1 April 2006	0.793 m
1 May 2006	0.780 m
1 June 2006	0.726 m
1 July 2006	0.712 m
1 August 2006	0.715 m
1 September 2006	0.726 m
1 October 2006	0.752 m
1 November 2006	0.778 m
1 December 2006	0.807 m
1 January 2007	0.789 m
1 February 2007	0.784 m
1 March 2007	0.802 m
1 April 2007	0.753 m
1 May 2007	0.723 m
1 June 2007	0.749 m
1 July 2007	0.747 m
1 August 2007	0.750 m
1 September 2007	0.740 m
1 October 2007	0.764 m
1 November 2007	0.781 m
1 December 2007	0.807 m
1 January 2008	0.812 m
1 February 2008	0.846 m
1 March 2008	0.826 m
1 April 2008	0.831 m
1 May 2008	0.809 m
1 June 2008	0.776 m
1 July 2008	0.728 m
1 August 2008	0.731 m
1 September 2008	0.746 m
1 October 2008	0.765 m
1 November 2008	0.791 m
1 December 2008	0.799 m
1 January 2009	0.799 m
1 February 2009	0.809 m
1 March 2009	0.787 m
1 April 2009	0.766 m
1 May 2009	0.797 m
1 June 2009	0.761 m
1 July 2009	0.727 m
1 August 2009	0.707 m
1 September 2009	0.710 m
1 October 2009	0.735 m
1 November 2009	0.779 m
1 December 2009	0.789 m
1 January 2010	0.802 m
1 February 2010	0.808 m
1 March 2010	0.880 m
1 April 2010	0.887 m
1 May 2010	0.763 m
1 June 2010	0.734 m
1 July 2010	0.705 m
1 August 2010	0.692 m
1 September 2010	0.729 m
1 October 2010	0.740 m
1 November 2010	0.771 m
1 December 2010	0.866 m
1 January 2011	0.820 m
1 February 2011	0.791 m
1 March 2011	0.793 m
1 April 2011	0.768 m
1 May 2011	0.695 m
1 June 2011	0.686 m
1 July 2011	0.697 m
1 August 2011	0.710 m
1 September 2011	0.720 m
1 October 2011	0.732 m
1 November 2011	0.746 m
1 December 2011	0.790 m
1 January 2012	0.792 m
1 February 2012	0.755 m
1 March 2012	0.761 m
1 April 2012	0.763 m
1 May 2012	0.779 m
1 June 2012	0.755 m
1 July 2012	0.749 m
1 August 2012	0.707 m
1 September 2012	0.702 m
1 October 2012	0.768 m
1 November 2012	0.779 m
1 December 2012	0.855 m
1 January 2013	0.932 m
1 February 2013	1.032 m
1 March 2013	1.001 m
1 April 2013	0.992 m
1 May 2013	0.932 m
1 June 2013	0.889 m
1 July 2013	0.818 m
1 August 2013	0.780 m
1 September 2013	0.797 m
1 October 2013	0.833 m
1 November 2013	0.931 m
1 December 2013	0.923 m
1 January 2014	0.926 m
1 February 2014	0.975 m
1 March 2014	0.924 m
1 April 2014	0.841 m
1 May 2014	0.927 m
1 June 2014	0.870 m
1 July 2014	0.898 m
1 August 2014	0.939 m
1 September 2014	0.865 m
1 October 2014	0.974 m
1 November 2014	0.894 m
1 December 2014	0.891 m
1 January 2015	0.899 m
1 February 2015	0.912 m
1 March 2015	0.903 m
1 April 2015	0.897 m
1 May 2015	0.907 m
1 June 2015	0.803 m
1 July 2015	0.759 m
1 August 2015	0.766 m
1 September 2015	0.800 m
1 October 2015	0.810 m
1 November 2015	0.827 m
1 December 2015	0.815 m
1 January 2016	0.826 m
1 February 2016	0.900 m
1 March 2016	0.864 m
1 April 2016	0.872 m
1 May 2016	0.874 m
1 June 2016	1.144 m
1 July 2016	0.854 m
1 August 2016	0.811 m
1 September 2016	0.835 m
1 October 2016	0.862 m
1 November 2016	0.889 m
1 December 2016	0.876 m
1 January 2017	0.874 m
1 February 2017	0.852 m
1 March 2017	0.873 m
1 April 2017	0.806 m
1 May 2017	0.803 m
1 June 2017	0.789 m
1 July 2017	0.778 m
1 August 2017	0.780 m
1 September 2017	0.803 m
1 October 2017	0.803 m
1 November 2017	0.829 m
1 December 2017	0.823 m
1 January 2018	0.902 m
1 February 2018	0.936 m
1 March 2018	0.914 m
1 April 2018	0.887 m
1 May 2018	0.855 m
1 June 2018	0.865 m
1 July 2018	0.808 m
1 August 2018	0.768 m
1 September 2018	0.783 m
1 October 2018	0.799 m
1 November 2018	0.822 m
1 December 2018	0.827 m
1 January 2019	0.816 m
1 February 2019	0.836 m
1 March 2019	0.835 m
1 April 2019	0.800 m
1 May 2019	0.786 m
1 June 2019	0.788 m
1 July 2019	0.731 m
1 August 2019	0.735 m
1 September 2019	0.742 m
1 October 2019	0.772 m
1 November 2019	0.804 m
1 December 2019	0.846 m
1 January 2020	0.807 m
1 February 2020	0.859 m
1 March 2020	0.912 m
1 April 2020	0.797 m
1 May 2020	0.841 m
1 June 2020	0.806 m
1 July 2020	0.760 m
1 August 2020	0.740 m
1 September 2020	0.762 m
1 October 2020	0.793 m
1 November 2020	0.791 m
1 December 2020	0.810 m
1 January 2021	0.837 m
1 February 2021	0.883 m
1 March 2021	0.826 m
1 April 2021	0.804 m
1 May 2021	0.806 m
1 June 2021	0.793 m
1 July 2021	0.797 m
1 August 2021	0.772 m
1 September 2021	0.794 m
1 October 2021	0.797 m
1 November 2021	0.807 m
1 December 2021	0.832 m
1 January 2022	0.852 m
1 February 2022	0.828 m
1 March 2022	0.819 m
1 April 2022	0.818 m
1 May 2022	0.769 m
1 June 2022	0.764 m
1 July 2022	0.749 m
1 August 2022	0.721 m
1 September 2022	0.740 m
1 October 2022	0.768 m
1 November 2022	0.774 m
1 December 2022	0.782 m
1 January 2023	0.823 m
1 February 2023	0.783 m
1 March 2023	0.792 m
1 April 2023	0.795 m
1 May 2023	0.765 m
1 June 2023	0.742 m
1 July 2023	0.723 m
1 August 2023	0.736 m
1 September 2023	0.737 m
1 October 2023	0.764 m
1 November 2023	0.791 m
1 December 2023	0.812 m
1 January 2024	0.820 m
1 February 2024	0.852 m
1 March 2024	0.890 m
1 April 2024	0.879 m
1 May 2024	0.853 m
1 June 2024	0.859 m
1 July 2024	0.815 m
1 August 2024	0.789 m
1 September 2024	0.814 m
1 October 2024	0.888 m
1 November 2024	0.866 m
1 December 2024	0.893 m
1 January 2025	0.975 m
1 February 2025	0.940 m
1 March 2025	0.932 m
1 April 2025	0.923 m
1 May 2025	0.891 m
1 June 2025	0.842 m
1 July 2025	0.823 m
1 August 2025	0.809 m
1 September 2025	0.845 m
1 October 2025	0.839 m
1 November 2025	0.844 m
1 December 2025	0.851 m
1 January 2026	0.839 m
1 February 2026	0.957 m
1 March 2026	0.869 m
1 April 2026	0.825 m
1 May 2026	0.827 m
1 June 2026	0.786 m
1 July 2026	0.744 m
1 August 2026	0.725 m
1 September 2026	0.738 m
1 October 2026	0.758 m

How this compares

The daily high on 25 October 2026 was 0.779 m, the eighteenth highest for 25 October in 41 years of record (1985 to 2026). The newest value is provisional.
That is 0.02 m below the median of 0.80 m for 25 October over the last 10 years. The newest value is provisional.

Same date in past years

25 October in the last 10 years

Day	Level	Against the normal range for the date
25 October 2025	0.837 m
25 October 2024	0.834 m
25 October 2023	0.769 m
25 October 2022	0.772 m
25 October 2021	0.81 m
25 October 2020	0.799 m
25 October 2019	0.769 m
25 October 2018	0.796 m
25 October 2017	0.816 m
25 October 2016	0.886 m

Year by year

Lowest and highestAcross the year

The lowest and highest daily high of each year

Each year, lowest to highest
The year so far
Lowest in our series
Highest in our series

The lowest and highest daily high of the Essonne at Boulancourt in each year from 1986 to 2025 with a value on at least 300 days, and in 2026 so far. The lowest daily high in our series since 24 August 1985 was 0.127 m, on 31 July 1996. The highest was 1.861 m, on 2 June 2016.

Table: The lowest and highest daily high of each year

Year	Lowest daily high (m)	Day	Highest daily high (m)	Day	Days with a value
1986	0.468 m	31 July	1.06 m	20 May	308
1987	0.572 m	15 July	0.977 m	27 November	327
1988	0.612 m	23 June	1.243 m	14 February	366
1989	0.405 m	26 August	0.888 m	1 March	356
1990	0.18 m	4 September	0.753 m	5 February	332
1991	0.198 m	5 September	0.698 m	24 March	347
1992	0.156 m	19 August	0.639 m	15 April	366
1993	0.143 m	20 August	0.851 m	10 May	365
1994	0.15 m	11 August	0.801 m	4 February	365
1995	0.326 m	21 July	1.035 m	21 March	365
1996	0.127 m	31 July	0.881 m	9 October	366
1997	0.644 m	3 August	1.138 m	27 February	365
1998	0.652 m	31 August	0.903 m	9 April	365
1999	0.674 m	3 August	1.061 m	30 December	365
2000	0.795 m	17 August	1.137 m	25 April	366
2001	0.847 m	3 July	1.327 m	31 December	365
2002	0.822 m	18 August	1.429 m	16 February	365
2003	0.764 m	14 August	1.196 m	5 January	365
2004	0.734 m	5 August	1.174 m	15 January	304
2005	0.718 m	14 August	0.985 m	24 January	321
2006	0.705 m	2 August	0.944 m	8 December	365
2007	0.712 m	11 May	0.941 m	3 March	358
2008	0.715 m	25 July	1.034 m	30 May	366
2009	0.691 m	24 August	0.948 m	12 May	365
2010	0.68 m	12 August	1.036 m	24 December	365
2011	0.677 m	24 May	0.918 m	17 December	365
2012	0.693 m	26 August	1.002 m	28 December	366
2013	0.767 m	14 August	1.304 m	14 March	365
2014	0.807 m	20 April	1.326 m	2 May	365
2015	0.75 m	6 August	1.184 m	5 May	365
2016	0.798 m	26 August	1.861 m	2 June	366
2017	0.753 m	8 August	1.02 m	8 March	365
2018	0.761 m	8 August	1.017 m	18 February	365
2019	0.713 m	27 July	0.922 m	14 December	365
2020	0.728 m	13 August	1.168 m	7 March	366
2021	0.754 m	2 September	0.951 m	8 February	365
2022	0.709 m	4 August	0.93 m	11 January	365
2023	0.708 m	20 July	0.945 m	17 January	365
2024	0.766 m	16 August	1.112 m	12 October	366
2025	0.782 m	17 August	1.07 m	28 February	365
2026so far, provisional	0.713 m	15 August	1.125 m	21 February	298

Each year from January to December, weekly averages of daily highs

The year so far
2025, the year before
Year of the lowest day in our series
Year of the highest day in our series
Other years
Normal range for the week

The weekly averages of daily highs of the Essonne at Boulancourt in each year from 1986 to 2025 with a value in at least 26 weeks, and in 2026 so far, on one axis from January to December, with the normal range for each week. The lowest daily high in our series since 24 August 1985 was in 1996, the highest in 2016. Each week is 7 days counted from 1 January (in a leap year, the weeks after 29 February start a day earlier), the last to 31 December.

Table: Each year from January to December, weekly averages of daily highs

Week	2026 so far Weekly average of daily highs (m)	1996, lowest day Weekly average of daily highs (m)	2016, highest day Weekly average of daily highs (m)	Normal range (m)
1 Jan to 7 Jan	0.828 m	0.579 m	0.821 m	0.517 m to 0.956 m
8 Jan to 14 Jan	0.841 m	0.655 m	0.843 m	0.544 m to 0.934 m
15 Jan to 21 Jan	0.837 m	0.529 m	0.824 m	0.552 m to 0.942 m
22 Jan to 28 Jan	0.844 m	0.556 m	0.813 m	0.560 m to 0.966 m
29 Jan to 4 Feb	0.873 m	0.529 m	0.843 m	0.580 m to 0.979 m
5 Feb to 11 Feb	0.900 m	0.518 m	0.877 m	0.578 m to 0.991 m
12 Feb to 18 Feb	1.002 m	0.583 m	0.975 m	0.566 m to 0.974 m
19 Feb to 25 Feb	1.035 m	0.565 m	0.883 m	0.555 m to 0.959 m
26 Feb to 4 Mar	0.883 m	0.532 m	0.878 m	0.555 m to 0.957 m
5 Mar to 11 Mar	0.858 m	0.516 m	0.891 m	0.532 m to 0.963 m
12 Mar to 18 Mar	0.896 m	0.504 m	0.874 m	0.538 m to 0.959 m
19 Mar to 25 Mar	0.864 m	0.498 m	0.835 m	0.551 m to 0.952 m
26 Mar to 1 Apr	0.853 m	0.483 m	0.857 m	0.551 m to 0.951 m
2 Apr to 8 Apr	0.837 m	0.476 m	0.965 m	0.535 m to 0.941 m
9 Apr to 15 Apr	0.831 m	0.457 m	0.863 m	0.519 m to 0.934 m
16 Apr to 22 Apr	0.820 m	0.404 m	0.842 m	0.506 m to 0.923 m
23 Apr to 29 Apr	0.809 m	0.368 m	0.830 m	0.452 m to 0.924 m
30 Apr to 6 May	0.820 m	0.351 m	0.823 m	0.422 m to 0.938 m
7 May to 13 May	0.864 m	0.374 m	0.823 m	0.413 m to 0.929 m
14 May to 20 May	0.830 m	0.371 m	0.836 m	0.388 m to 0.914 m
21 May to 27 May	0.811 m	0.379 m	0.908 m	0.391 m to 0.911 m
28 May to 3 Jun	0.798 m	0.397 m	1.229 m	0.400 m to 0.904 m
4 Jun to 10 Jun	0.794 m	0.384 m	1.364 m	0.407 m to 0.897 m
11 Jun to 17 Jun	0.793 m	0.373 m	1.075 m	0.390 m to 0.891 m
18 Jun to 24 Jun	0.786 m	0.340 m	1.042 m	0.373 m to 0.881 m
25 Jun to 1 Jul	0.761 m	0.309 m	0.911 m	0.379 m to 0.867 m
2 Jul to 8 Jul	0.750 m	0.320 m	0.885 m	0.363 m to 0.857 m
9 Jul to 15 Jul	0.760 m	0.351 m	0.867 m	0.347 m to 0.855 m
16 Jul to 22 Jul	0.743 m	0.329 m	0.847 m	0.320 m to 0.845 m
23 Jul to 29 Jul	0.728 m	0.229 m	0.829 m	0.269 m to 0.838 m
30 Jul to 5 Aug	0.723 m	0.153 m	0.824 m	0.234 m to 0.835 m
6 Aug to 12 Aug	0.718 m	0.139 m	0.814 m	0.208 m to 0.824 m
13 Aug to 19 Aug	0.717 m	0.148 m	0.809 m	0.207 m to 0.822 m
20 Aug to 26 Aug	0.727 m	0.163 m	0.815 m	0.215 m to 0.825 m
27 Aug to 2 Sep	0.744 m	0.363 m	0.800 m	0.229 m to 0.826 m
3 Sep to 9 Sep	0.740 m	0.620 m	0.819 m	0.245 m to 0.827 m
10 Sep to 16 Sep	0.736 m	0.623 m	0.829 m	0.287 m to 0.844 m
17 Sep to 23 Sep	0.735 m	0.628 m	0.857 m	0.311 m to 0.852 m
24 Sep to 30 Sep	0.740 m	0.633 m	0.837 m	0.332 m to 0.856 m
1 Oct to 7 Oct	0.746 m	0.676 m	0.850 m	0.332 m to 0.857 m
8 Oct to 14 Oct	0.759 m	0.686 m	0.854 m	0.342 m to 0.864 m
15 Oct to 21 Oct	0.757 m	0.659 m	0.864 m	0.351 m to 0.872 m
22 Oct to 28 Oct	no value	0.657 m	0.873 m	0.404 m to 0.868 m
29 Oct to 4 Nov	no value	0.669 m	0.867 m	0.421 m to 0.874 m
5 Nov to 11 Nov	no value	0.693 m	0.881 m	0.429 m to 0.885 m
12 Nov to 18 Nov	no value	0.696 m	0.896 m	0.432 m to 0.898 m
19 Nov to 25 Nov	no value	0.697 m	0.898 m	0.405 m to 0.904 m
26 Nov to 2 Dec	no value	0.769 m	0.888 m	0.433 m to 0.909 m
3 Dec to 9 Dec	no value	0.768 m	0.883 m	0.485 m to 0.905 m
10 Dec to 16 Dec	no value	0.716 m	0.877 m	0.488 m to 0.905 m
17 Dec to 23 Dec	no value	0.707 m	0.876 m	0.501 m to 0.908 m
24 Dec to 31 Dec	no value	0.710 m	0.871 m	0.481 m to 0.942 m

Every year

Year	Days with a value	Days below the normal range
2026to 25 October 2026	298	0
2025	365	0
2024	366	0
2023	365	0
2022	365	0
2021	365	0
2020	366	0
2019	365	0
2018	365	0
2017	365	0
2016	366	0
2015	365	0
2014	365	0
2013	365	0
2012	366	0
2011	365	0
2010	365	0
2009	365	0
2008	366	0
2007	358	0
2006	365	0
2005	321	0
2004	304	0
2003	365	0
2002	365	0
2001	365	0
2000	366	0
1999	365	0
1998	365	0
1997	365	0
1996	366	192
1995	365	38
1994	365	268
1993	365	175
1992	366	360
1991	347	284
1990	332	121
1989	356	0
1988	366	0
1987	327	0
1986	308	0
1985	130	0

How it compares

That is within the normal range for the date.

Records

Highest daily high in our series since 24 August 1985: 1.861 m on 2 June 2016.
Lowest daily high in our series since 24 August 1985: 0.127 m on 31 July 1996.

Also on this water

About this gauge

Boulancourt is a gauge on the Essonne in Seine-et-Marne, France.

It lies at 48.2577° N, 2.4275° E.

Its readings come from France's national network of river gauges (Vigicrues and its partners), through Hub'Eau.

Hub'Eau's daily highs for this gauge go back to 24 August 1985.

Hub'Eau's newest readings are mostly raw data that the gauge's operator checks and validates later.

The newest reading is provisional: the source may still correct it.

About these figures

The normal range for 25 October is 0.40 m to 0.87 m: the 10th to 90th percentile of the daily highs from 18 October to 1 November in 40 years between 1985 and 2025.

Keep exploring

Sources

Source : Hub'Eau / SCV, données PHyC (Licence Ouverte Etalab) (source). Licence: Licence Ouverte / Open Licence version 2.0