Most Monthly Precipitation in Winthrop History

This is a list of the largest monthly precipitation totals ever recorded in Winthrop, Washington history from 1906–2024.

What Was the Wettest Month in Winthrop History?

According to NOAA records, the most precipitation that Winthrop, Washington has ever received in a single month is 8.2 inches which occurred in December 1933.

Winthrop Most Rain in One Month

Rank	Precipitation	Month
1	8.2 inches	December 1933
2	7.2 inches	December 1996
3	7.0 inches	December 1968
4	6.1 inches	November 1906
5	5.4 inches	December 1987
6	5.3 inches	December 1973
7	5.3 inches	November 1909
8	5.3 inches	November 1983
9	5.0 inches	November 1910
10	4.9 inches	January 1953
11	4.8 inches	December 1915
12	4.8 inches	December 1971
13	4.8 inches	December 1955
14	4.7 inches	November 2006
15	4.7 inches	December 2015
16	4.6 inches	January 1914
17	4.6 inches	January 2012
17	4.6 inches	December 1979
19	4.6 inches	December 1970
20	4.6 inches	November 1958