Most Daily Precipitation in Cornwall History

This is a list of the largest daily precipitation totals ever recorded in Cornwall, Ontario history from 1867–2024.

What's the Most It Has Ever Rained in Cornwall?

According to NOAA records, the most rain that Cornwall, Ontario has ever received in a single day is 11.0 cm which occurred on Friday September 14, 1979.

Also see most rain in: 2 days | 1 week | 1 month

Cornwall Most Rain in One Day

Rank	Precipitation	Date
1	11.0 cm	September 14, 1979
2	9.3 cm	September 30, 2010
3	8.2 cm	August 31, 2005
4	8.1 cm	September 5, 1973
5	8.0 cm	September 27, 1985
6	7.3 cm	July 17, 1977
7	7.1 cm	August 20, 1962
8	7.0 cm	October 31, 2019
8	7.0 cm	August 25, 1982
10	6.7 cm	June 13, 2003
11	6.3 cm	September 9, 2004
12	6.1 cm	October 13, 2005
13	6.1 cm	July 7, 2013
14	6.0 cm	July 31, 2006
15	5.9 cm	June 23, 1969
16	5.7 cm	October 27, 1981
17	5.7 cm	July 25, 2006
17	5.7 cm	November 28, 2003
19	5.6 cm	August 18, 1969
20	5.6 cm	July 18, 2022