Historical Ranked Annual Data - Maximum Hourly Rain / mm
Top annual highest
#
Value
Date
1
33.3
2009
2
32.0
2026
3
26.4
2025
4
25.5
2021
5
23.3
2014
6
23.1
2022
7
18.4
2011
8
16.5
2024
9
16.0
2017
10
14.1
2012
11
13.9
2023
12
13.4
2018
13
13.1
2010
14
11.5
2016
15
11.2
2015
16
10.8
2019
17
10.0
2020
18
9.2
2013
2
32.0
Current year
3
26.4
Last year
Bottom annual highest
#
Value
Date
1
9.2
2013
2
10.0
2020
3
10.8
2019
4
11.2
2015
5
11.5
2016
6
13.1
2010
7
13.4
2018
8
13.9
2023
9
14.1
2012
10
16.0
2017
11
16.5
2024
12
18.4
2011
13
23.1
2022
14
23.3
2014
15
25.5
2021
16
26.4
2025
17
32.0
2026
18
33.3
2009
17
32.0
Current year
16
26.4
Last year
Maximum Hourly Rain annual extremes: highest and lowest annual maxima.
There are 18 valid years for the chosen period from 2009 to present in London, NW3. Data for Maximum Hourly Rain begins in 2009.