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Monthly Data Tables - Maximum Hourly Rain / mm

Total Max hour Max 10-min Max rate Mean rate Wet hours Wet % of day

Monthly

Mean Lowest Highest

Start year

1871 1910 1950 1980 2000 2009 2020

Monthly Mean Maximum Hourly Rain

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

1.8

2.1

2.1

2.1

2.3

1.9

1.5

1.7

2.0

2.1

1.9

1.8

2.5

1.8

2.1

2.0

2.2

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.

Monthly Lowest Maximum Hourly Rain

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

0.0

0.0

0.0

0.2

0.0

0.0

0.0

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.3

0.3

0.3

0.3

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

Lowest

0.0

0.0

0.2

0.2

0.0

0.0

0.0

0.2

0.0

0.0

0.0

0.0

0.0

Highest

0.4

0.6

2.6

1.0

1.1

1.6

1.3

3.4

1.1

1.3

0.8

0.9

0.3

Mean

0.2

0.2

0.4

0.3

0.3

0.4

0.4

0.4

0.4

0.3

0.3

0.3

0.2

Maximum Hourly Rain: lowest daily value each month for all months since 2009 in London, NW3. Data for Maximum Hourly Rain begins in 2009.

Monthly Highest Maximum Hourly Rain

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

32.0

26.4

16.5

13.9

23.1

25.5

10.0

10.8

13.4

16.0

11.5

11.2

23.3

9.2

14.1

18.4

13.1

33.3

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.