Half Moon Bay May Precipitation Totals

A time series of total precipitation in the month of May in Half Moon Bay, California from 1940–2023.

Rainiest May in Half Moon Bay History

The rainiest May in Half Moon Bay, California history happened in 1957, with 4.10 inches of total precipitation.

Driest May in Half Moon Bay History

There have been 3 times where no rain was recorded in Half Moon Bay, California for the entire month of May. The most recent time this happened was 1982.

Half Moon Bay Average May Precipitation by Year

Read important notes
Click column headers to sort

Year	Precipitation (inches)
2023	1.92
2022	0.19
2021	0.14
2020	0.68
2019	2.66
2018	0.23
2017	0.02
2016	0.15
2015	0.11
2014	0.05
2013	0.24
2012	0.15
2011	1.16
2010	2.06
2009	1.39
2008	0.11
2007	0.46
2006	0.50
2005	2.32
2004	0.15
2000	1.72
1999	0.12
1998	4.01
1997	0.44
1996	2.16
1995	1.54
1993	1.38
1991	0.67
1990	2.82
1989	0.31
1988	0.69
1987	0.06
1986	0.84
1985	0.32
1984	0.20
1983	0.89
1982	0.00
1981	0.33
1980	0.32
1979	0.85
1978	0.00
1977	1.23
1976	0.13
1975	0.10
1974	0.01
1973	0.21
1972	0.11
1971	0.53
1970	0.27
1969	0.06
1968	0.24
1967	0.25
1966	0.20
1965	0.00
1964	0.47
1963	0.64
1962	0.24
1961	1.73
1960	0.71
1959	0.36
1958	0.68
1957	4.10
1956	1.14
1955	0.36
1954	0.06
1953	0.60
1952	0.45
1951	0.98
1950	0.37
1949	0.41
1948	0.52
1947	0.44
1946	0.89
1945	0.94
1944	1.05
1943	0.09
1942	1.32
1941	1.07
1940	0.41

Notes

Its possible for precipitation totals to include both rain and melted snowfall
Months with more than 10% missing data are excluded