Most Monthly Precipitation in London History

This is a list of the largest monthly precipitation totals ever recorded in London, Ontario history from 1883–2024.

What Was the Wettest Month in London History?

According to NOAA records, the most precipitation that London, Ontario has ever received in a single month is 31.4 cm which occurred in September 1996.

London Most Rain in One Month

Rank	Precipitation	Month
1	31.4 cm	September 1996
2	31.3 cm	June 1892
3	25.9 cm	July 1932
4	24.9 cm	May 1894
5	23.6 cm	September 1986
6	23.5 cm	January 1913
7	22.8 cm	July 1915
8	22.7 cm	August 1964
9	22.7 cm	October 1954
10	22.6 cm	August 1940
11	22.2 cm	July 1883
12	21.5 cm	April 1937
13	21.0 cm	February 1887
14	20.8 cm	June 1943
15	20.6 cm	June 2000
16	20.5 cm	September 1945
17	20.5 cm	July 1992
18	18.8 cm	May 2004
19	18.8 cm	September 1977
20	18.4 cm	November 1927