Most Monthly Precipitation in Walla Walla History

This is a list of the largest monthly precipitation totals ever recorded in Walla Walla, Washington history from 1949–2024.

What Was the Wettest Month in Walla Walla History?

According to NOAA records, the most precipitation that Walla Walla, Washington has ever received in a single month is 6.6 inches which occurred in May 1991.

Walla Walla Most Rain in One Month

Rank	Precipitation	Month
1	6.6 inches	May 1991
2	5.9 inches	January 1970
3	5.4 inches	December 1973
4	5.3 inches	January 1953
5	5.1 inches	November 1973
6	4.9 inches	November 1991
7	4.9 inches	January 1975
8	4.8 inches	December 1968
9	4.7 inches	July 1992
10	4.7 inches	November 1984
11	4.7 inches	November 2006
12	4.7 inches	December 1964
13	4.6 inches	November 1986
14	4.6 inches	October 2016
15	4.4 inches	October 1950
16	4.4 inches	January 1969
17	4.3 inches	March 1983
18	4.3 inches	March 1984
19	4.2 inches	November 1988
19	4.2 inches	January 2003