Historical Ranked Periods - Mean Rain Rate / mm/h · 5-day mean
Start year
Top 5-day mean
#
Value
Date
1
3.1
15–19 Aug 2020
2
3.0
2–6 Nov 2022
3
2.6
29 Apr – 3 May 2010
4
2.5
19–23 Oct 2013
5
2.2
3–7 Jan 2014
6
2.2
23–27 Aug 2015
7
2.1
8–12 Aug 2014
8
2.1
29 Oct – 2 Nov 2022
9
2.0
1–5 Oct 2021
10
2.0
16–20 Jul 2011
11
1.9
6–10 Oct 2014
12
1.9
22–26 Sep 2024
13
1.9
26–30 May 2018
14
1.9
3–7 Jun 2012
15
1.8
5–9 Sep 2022
16
1.8
29 Aug – 2 Sep 2015
17
1.8
26–30 Aug 2025
18
1.8
8–12 Jul 2012
19
1.8
31 Dec 2023 – 4 Jan 2024
20
1.8
8–12 Jun 2011
21
1.7
20–24 Oct 2022
22
1.7
10–14 Jan 2011
23
1.7
18–22 Jul 2017
24
1.7
5–9 Jul 2024
25
1.7
22–26 Jan 2014
Bottom 5-day mean
#
Value
Date
1
0.4
19–23 Mar 2023
2
0.4
27 Jun – 1 Jul 2016
3
0.4
1–5 Feb 2017
4
0.5
17–21 Dec 2024
5
0.5
12–16 Jun 2019
6
0.5
26 Feb – 2 Mar 2018
7
0.5
30 Mar – 3 Apr 2015
8
0.5
24–28 Apr 2018
9
0.5
5–9 Mar 2019
10
0.6
14–18 Feb 2022
11
0.6
25–29 Nov 2019
12
0.6
19–23 Feb 2026
13
0.6
8–12 Mar 2023
14
0.6
5–9 Mar 2018
15
0.6
30 Oct – 3 Nov 2023
16
0.6
5–9 Feb 2021
17
0.6
12–16 Jan 2020
18
0.6
9–13 Nov 2019
19
0.6
8–12 Sep 2013
20
0.7
26–30 Jan 2013
21
0.7
8–12 Jan 2014
22
0.7
14–18 Feb 2021
23
0.7
18–22 Dec 2020
24
0.7
13–17 Feb 2024
25
0.7
5–9 Dec 2025
Mean Rain Rate 5-day extremes: highest and lowest period means.
There are 270 valid 5-day periods from 2009 to present in London, NW3 (complete windows only, hiding overlapping windows). Data for Mean Rain Rate begins in 2009.
Mean rain rate during periods of rain, i.e. rain over wet hours, for the day (midnight to midnight, local time).