Most Monthly Precipitation in Janesville History

This is a list of the largest monthly precipitation totals ever recorded in Janesville, Wisconsin history from 1893–2024.

What Was the Wettest Month in Janesville History?

According to NOAA records, the most precipitation that Janesville, Wisconsin has ever received in a single month is 17.4 inches which occurred in August 2007.

Janesville Most Rain in One Month

Rank	Precipitation	Month
1	17.4 inches	August 2007
2	11.6 inches	September 2019
3	11.2 inches	July 2017
4	10.9 inches	August 1979
5	10.2 inches	July 2016
6	9.9 inches	June 1978
7	9.9 inches	September 1970
8	9.8 inches	September 1961
9	9.5 inches	June 2013
10	9.5 inches	April 2013
11	9.3 inches	June 1993
12	9.3 inches	August 1981
13	8.4 inches	September 1986
14	8.4 inches	August 1952
15	8.3 inches	July 1982
16	8.2 inches	August 1972
17	8.1 inches	June 2008
18	8.1 inches	August 2018
19	8.0 inches	August 1965
20	7.9 inches	July 1959