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Last Full Update: 02 Aug 2026, 08:45 BSTUpdated: 02 Aug 26 08:45
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Monthly Data Tables - Maximum Hourly Rain / mm

TotalMax hourMax 10-minMax rateMean rateWet hoursWet % of day
Monthly
MeanLowestHighestRangeCount ≥Count <
Threshold
0.21.03.05.010.020.0
Start year
2009

Monthly Mean Maximum Hourly Rain
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
2026
1.7
1.7
1.8
0.6
0.8
4.2
-
-
1.8
2025
1.7
1.4
0.9
3.3
4.2
1.6
2.5
1.5
1.7
2.7
1.6
1.8
2.1
2024
1.8
1.2
1.5
1.6
2.7
0.7
3.8
2.0
4.3
1.8
2.6
1.2
2.1
2023
1.3
0.5
1.5
1.5
1.7
6.0
1.7
2.3
3.2
2.5
2.0
1.2
2.1
2022
0.8
1.5
0.7
2.0
1.1
1.6
0.4
10.3
2.2
1.9
3.4
1.1
2.3
2021
1.5
1.3
1.2
0.8
1.8
2.7
3.8
1.5
2.7
2.9
0.4
1.9
1.9
2020
1.6
1.7
1.4
1.7
1.9
1.6
1.0
2.3
1.1
1.7
0.9
1.4
1.5
2019
1.7
1.6
1.6
0.7
1.4
1.7
2.0
1.8
2.6
2.4
1.1
2.1
1.7
2018
1.7
1.1
1.5
1.2
2.2
0.2
5.3
2.7
2.1
2.0
2.0
1.6
2.0
2017
1.7
1.0
2.1
0.9
2.5
2.2
3.4
4.3
1.7
1.4
1.8
2.5
2.1
2016
1.5
1.6
1.9
1.4
2.5
2.3
2.4
0.7
2.9
2.8
1.8
0.8
1.9
2015
1.4
1.3
1.2
1.4
2.0
1.3
1.7
2.8
2.6
2.8
1.8
1.4
1.8
2014
2.1
1.9
1.8
1.5
1.5
1.7
2.8
4.9
5.9
2.2
2.5
1.2
2.5
2013
1.1
1.1
1.2
1.4
1.6
1.6
2.6
3.2
1.7
2.6
1.5
2.3
1.8
2012
2.4
1.0
3.2
1.9
1.9
2.2
2.0
2.0
2.5
1.9
2.4
1.9
2.1
2011
2.2
1.5
1.2
0.5
2.2
2.8
2.3
3.1
3.4
1.3
2.0
1.6
2.0
2010
1.1
1.7
1.1
1.6
5.5
2.6
1.3
3.1
3.4
2.6
1.3
1.1
2.2
2009
2.4
1.5
2.0
1.2
1.7
4.9
1.7
2.2
3.8
1.5
2.6
1.6
2.3
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
Lowest
0.8
0.5
0.7
0.5
0.8
0.2
0.4
0.7
1.1
1.3
0.4
0.8
1.5
Highest
2.4
1.9
3.2
3.3
5.5
6.0
5.3
10.3
5.9
2.9
3.4
2.5
2.5
Mean
1.7
1.4
1.5
1.4
2.2
2.3
2.4
3.0
2.8
2.2
1.8
1.6
2.0

Maximum Hourly Rain: monthly means 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).

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