Historical Ranked Monthly Data - Maximum Hourly Rain / mm
Start year
Top monthly mean
#
Value
Date
1
10.3
Aug 2022
2
6.0
Jun 2023
3
5.9
Sep 2014
4
5.5
May 2010
5
5.3
Jul 2018
6
4.9
Aug 2014
7
4.9
Jun 2009
8
4.3
Sep 2024
9
4.3
Aug 2017
10
4.2
Jun 2026
11
4.2
May 2025
12
3.8
Sep 2009
13
3.8
Jul 2024
14
3.8
Jul 2021
15
3.4
Sep 2011
16
3.4
Nov 2022
17
3.4
Jul 2017
18
3.4
Sep 2010
19
3.3
Apr 2025
20
3.2
Sep 2023
21
3.2
Mar 2012
22
3.2
Aug 2013
23
3.1
Aug 2010
24
3.1
Aug 2011
25
2.9
Sep 2016
Bottom monthly mean
#
Value
Date
1
0.2
Jun 2018
2
0.4
Jul 2022
3
0.4
Nov 2021
4
0.5
Apr 2011
5
0.5
Feb 2023
6
0.6
Apr 2026
7
0.7
Apr 2019
8
0.7
Mar 2022
9
0.7
Jun 2024
10
0.7
Aug 2016
11
0.8
Dec 2016
12
0.8
Apr 2021
13
0.8
May 2026
14
0.8
Jan 2022
15
0.9
Apr 2017
16
0.9
Mar 2025
17
0.9
Nov 2020
18
1.0
Jul 2020
19
1.0
Feb 2012
20
1.0
Feb 2017
21
1.1
May 2022
22
1.1
Mar 2010
23
1.1
Feb 2013
24
1.1
Nov 2019
25
1.1
Dec 2010
Maximum Hourly Rain monthly extremes: highest and lowest monthly means.
There are 210 valid months for the chosen period from 2009 to present in London, NW3. 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).