Historical Ranked Periods - Maximum Hourly Rain / mm · 5-day mean
Start year
Top 5-day mean
#
Value
Date
1
8.7
2–6 Nov 2022
2
8.2
22–26 Sep 2024
3
7.2
8–12 Aug 2014
4
5.7
1–5 Oct 2021
5
5.3
5–9 Jul 2024
6
4.8
17–21 Sep 2023
7
4.6
23–27 Aug 2015
8
4.5
29 Oct – 2 Nov 2022
9
4.4
27 Sep – 1 Oct 2019
10
4.1
11–15 Jul 2021
11
3.9
29 Oct – 2 Nov 2025
12
3.8
15–19 Aug 2020
13
3.8
23–27 Nov 2024
14
3.7
19–23 Oct 2013
15
3.6
20–24 Oct 2022
16
3.6
29 Aug – 2 Sep 2015
17
3.5
4–8 Nov 2014
18
3.4
12–16 Nov 2009
19
3.4
2–6 Oct 2010
20
3.3
16–20 Jul 2011
21
3.3
24–28 Jul 2015
22
3.2
5–9 Aug 2021
23
3.2
22–26 Jan 2014
24
3.2
5–9 Sep 2022
25
3.1
13–17 May 2021
Bottom 5-day mean
#
Value
Date
1
0.2
8–12 Nov 2021
2
0.4
28 Jun – 2 Jul 2016
3
0.5
16–20 Nov 2020
4
0.6
5–9 Feb 2022
5
0.6
1–5 Feb 2017
6
0.6
19–23 Mar 2023
7
0.6
1–5 Mar 2022
8
0.6
23–27 Nov 2019
9
0.6
24–28 Dec 2022
10
0.7
8–12 Jan 2014
11
0.7
1–5 Jan 2023
12
0.7
8–12 Apr 2009
13
0.7
3–7 Mar 2018
14
0.7
1–5 Jul 2020
15
0.7
23–27 Jan 2021
16
0.8
13–17 Mar 2022
17
0.8
13–17 Dec 2015
18
0.8
2–6 Mar 2016
19
0.8
6–10 Dec 2020
20
0.8
16–20 Dec 2020
21
0.8
18–22 Dec 2024
22
0.9
24–28 Apr 2018
23
0.9
26–30 Mar 2010
24
0.9
28 Mar – 1 Apr 2015
25
0.9
14–18 Jan 2015
Maximum Hourly Rain 5-day extremes: highest and lowest period means.
There are 437 valid 5-day periods from 2009 to present in London, NW3 (complete windows only, hiding overlapping windows). Data for Maximum Hourly Rain begins in 2009.
Largest amount of rain that fell in any single hour during the day (midnight to midnight, local time).