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Last Full Update: 02 Aug 2026, 10:50 BSTUpdated: 02 Aug 26 10:50
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Monthly Data Tables - Maximum Rain Rate / mm/h

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

Monthly Mean Maximum Rain Rate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
2026
6
9
8
9
7
27
-
-
11
2025
16
4.7
3.0
10
31
11
7
14
18
21
9
8
13
2024
12
6
7
15
37
7
28
16
26
13
12
8
16
2023
9
1.9
7
8
11
36
9
22
29
12
7
4.9
13
2022
11
16
4.4
23
4.5
16
8
65
17
17
20
8
17
2021
6
6
5
1.0
7
7
25
11
17
19
3.8
6
10
2020
13
18
15
11
54
26
12
24
11
16
11
12
19
2019
10
3.7
8
4.0
17
17
8
19
21
19
4.3
10
12
2018
17
3.8
7
5
12
-
34
26
8
6
16
8
13
2017
9
9
14
14
23
28
28
27
15
15
8
12
17
2016
9
23
11
10
27
24
38
4.5
37
53
14
6
21
2015
11
8
14
14
15
24
21
24
30
22
21
26
19
2014
15
13
10
7
17
17
31
33
46
22
20
11
20
2013
9
7
3.8
6
8
18
21
36
8
24
6
14
13
2012
25
11
18
12
8
15
15
30
19
15
15
9
16
2011
12
4.7
2.8
-
20
13
25
20
20
15
6
10
13
2010
4.3
6
8
10
31
24
14
29
19
12
8
7
14
2009
-
-
-
11
10
28
14
17
18
3.0
-
3.2
13
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
Lowest
4.3
1.9
2.8
1.0
4.5
7
7
4.5
8
3.0
3.8
3.2
10
Highest
25
23
18
23
54
36
38
65
46
53
21
26
21
Mean
12
9
9
10
19
20
20
25
21
18
11
10
15

Maximum Rain Rate: monthly means for all months since 2009 in London, NW3. Data for Maximum Rain Rate begins in 2009.

Highest instantaneous rain rate (1-min avg) recorded during the day (midnight to midnight, local time).

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