Most Monthly Precipitation in Washington D.C. History

This is a list of the largest monthly precipitation totals ever recorded in Washington D.C. history from 1851–2024.

What Was the Wettest Month in Washington D.C. History?

According to NOAA records, the most precipitation that Washington D.C. has ever received in a single month is 17.5 inches which occurred in September 1934.

Month to date though April 22, 2024: 2.0 inches

Washington D.C. Most Rain in One Month

Rank	Precipitation	Month
1	17.5 inches	September 1934
2	14.4 inches	August 1928
3	14.4 inches	August 1906
4	14.3 inches	August 1955
5	14.0 inches	June 2006
6	12.9 inches	August 1875
7	12.4 inches	September 1975
8	11.9 inches	June 2015
9	11.5 inches	June 1972
10	11.1 inches	July 1945
11	10.9 inches	June 1900
12	10.8 inches	September 1876
13	10.7 inches	May 1953
14	10.7 inches	May 1889
15	10.7 inches	May 2008
16	10.6 inches	July 1886
17	10.6 inches	May 1886
18	10.3 inches	September 1999
19	10.2 inches	August 1857
20	10.0 inches	June 2013