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Last Full Update: 02 Aug 2026, 08:45 BSTUpdated: 02 Aug 26 08:45
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Historical Ranked Annual Data - Maximum Hourly Rain / mm

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

Top annual lowest
#
Value
Date
1
0.3
2012
2
0.3
2011
3
0.3
2010
4
0.3
2009
5
0.2
2023
6
0.2
2019
7
0.2
2018
8
0.2
2017
9
0.2
2016
10
0.2
2015
11
0.2
2014
12
0.2
2013
13
0.0
2026
14
0.0
2025
15
0.0
2024
16
0.0
2022
17
0.0
2021
18
0.0
2020
13
0.0
Current year
14
0.0
Last year
Bottom annual lowest
#
Value
Date
1
0.0
2020
2
0.0
2021
3
0.0
2022
4
0.0
2024
5
0.0
2025
6
0.0
2026
7
0.2
2013
8
0.2
2014
9
0.2
2015
10
0.2
2016
11
0.2
2017
12
0.2
2018
13
0.2
2019
14
0.2
2023
15
0.3
2009
16
0.3
2010
17
0.3
2011
18
0.3
2012
6
0.0
Current year
5
0.0
Last year

Maximum Hourly Rain annual extremes: highest and lowest annual minima.
There are 18 valid years 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).

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