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Last Full Update: 02 Aug 2026, 08:50 BSTUpdated: 02 Aug 26 08:50
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Historical Ranked Annual Data - Mean Rain Rate / mm/h

TotalMax hourMax 10-minMax rateMean rateWet hoursWet % of day
Annual
MeanLowestHighestRangeCount ≥Count <
Threshold
0.21.03.051020
Start year
2009

Top annual highest
#
Value
Date
1
19
2025
2
16
2026
3
15
2014
4
14
2023
5
12
2009
6
9
2020
7
9
2022
8
9
2017
9
8
2012
10
7
2015
11
6
2016
12
6
2011
13
6
2018
14
6
2013
15
5
2021
16
5
2010
17
4.8
2019
18
4.2
2024
2
16
Current year
1
19
Last year
Bottom annual highest
#
Value
Date
1
4.2
2024
2
4.8
2019
3
5
2010
4
5
2021
5
6
2013
6
6
2018
7
6
2011
8
6
2016
9
7
2015
10
8
2012
11
9
2017
12
9
2022
13
9
2020
14
12
2009
15
14
2023
16
15
2014
17
16
2026
18
19
2025
17
16
Current year
18
19
Last year

Mean Rain Rate 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 Mean Rain Rate begins in 2009.

Mean rain rate during periods of rain, i.e. rain over wet hours, for the day (midnight to midnight, local time).

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