Historical Ranked Periods - Maximum Rain Rate / mm/h · 5-day mean
Start year
Top 5-day mean
#
Value
Date
1
43
8–12 Aug 2014
2
42
27 Sep – 1 Oct 2019
3
41
2–6 Nov 2022
4
41
23–27 Aug 2015
5
41
5–9 Jul 2024
6
38
16–20 Jul 2011
7
36
3–7 Jan 2014
8
35
20–24 Oct 2022
9
33
23–27 Sep 2024
10
31
5–9 Sep 2022
11
30
13–17 Aug 2020
12
27
6–10 Oct 2014
13
27
10–14 Jun 2019
14
27
29 Oct – 2 Nov 2022
15
21
14–18 Sep 2015
16
21
11–15 Sep 2025
17
20
5–9 Jun 2017
18
19
6–10 Oct 2020
19
19
23–27 Aug 2011
20
19
25–29 Apr 2012
21
19
26–30 Jan 2013
22
19
5–9 Aug 2021
23
18
8–12 Jun 2011
24
18
21–25 Nov 2012
25
17
28 Jan – 1 Feb 2014
Bottom 5-day mean
#
Value
Date
1
1.7
13–17 Feb 2024
2
1.9
5–9 Mar 2019
3
2.0
7–11 Mar 2023
4
2.9
27 Jun – 1 Jul 2016
5
2.9
5–9 Mar 2018
6
3.2
14–18 Feb 2021
7
3.2
28 Mar – 1 Apr 2010
8
3.3
3–7 Feb 2017
9
3.6
1–5 Dec 2018
10
3.8
25–29 Nov 2019
11
4.0
13–17 Dec 2013
12
4.0
11–15 Nov 2019
13
4.3
26–30 Jan 2021
14
4.4
3–7 Dec 2021
15
4.4
30 Mar – 3 Apr 2018
16
4.5
3–7 Nov 2013
17
4.8
16–20 Dec 2019
18
4.9
26–30 Jan 2014
19
6
5–9 Dec 2025
20
6
20–24 Feb 2025
21
6
21–25 Feb 2010
22
7
25–29 Dec 2021
23
7
24–28 Jan 2025
24
7
23–27 Nov 2012
25
8
9–13 Apr 2013
Maximum Rain Rate 5-day extremes: highest and lowest period means.
There are 175 valid 5-day periods from 2009 to present in London, NW3 (complete windows only, hiding overlapping windows). Data for Maximum Rain Rate begins in 2009.
Highest instantaneous rain rate (1-min avg) recorded during the day (midnight to midnight, local time).