Most Monthly Precipitation in Napa History

This is a list of the largest monthly precipitation totals ever recorded in Napa, California history from 1901–2024.

What Was the Wettest Month in Napa History?

According to NOAA records, the most precipitation that Napa, California has ever received in a single month is 16.1 inches which occurred in December 1955.

Month to date though April 24, 2024: 1.0 inches

Napa Most Rain in One Month

Rank	Precipitation	Month
1	16.1 inches	December 1955
2	15.3 inches	February 1986
3	15.1 inches	January 1916
4	15.0 inches	January 1909
5	14.2 inches	February 1998
6	13.8 inches	January 1970
7	13.7 inches	January 1995
8	13.5 inches	January 1911
9	12.9 inches	December 1996
10	12.8 inches	January 1914
11	12.2 inches	February 1902
12	12.1 inches	January 2017
13	12.0 inches	March 1995
14	11.7 inches	December 1952
15	11.7 inches	January 1967
16	11.6 inches	December 1931
17	11.5 inches	February 1919
18	11.4 inches	February 1938
19	11.4 inches	January 1973
20	11.3 inches	December 2005