Monthly Data Tables - Maximum Hourly Rain / mm
Start year
Monthly Highest Maximum Hourly Rain
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
Lowest
2.2
1.2
1.0
0.5
2.2
0.2
0.7
2.2
3.1
2.7
1.2
2.2
9.2
Highest
8.2
10.7
8.5
6.9
26.4
33.3
25.5
23.3
18.7
11.2
18.5
6.3
33.3
Mean
5.0
4.1
4.0
3.2
6.8
8.6
8.0
9.8
8.9
7.4
6.3
4.4
17.9
Maximum Hourly Rain: highest daily value each month for all months since 2009 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).