Average December Temperature in Half Moon Bay by Year

This page contains a list of the average monthly high and low temperatures in Half Moon Bay, California for the month of December each year between 1939 and 2023. It is based on NOAA data.

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What Was the Hottest December Ever in Half Moon Bay?

2014 was the warmest December in the history of Half Moon Bay, California. The average daily high temperature was 61.9 °F, and the average low was 48.5 °F.

What Was the Coldest December Ever in Half Moon Bay?

1990 was the coolest December in the history of Half Moon Bay, California. The average daily high temperature was 55.4 °F, and the average low was 35.6 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	13	60.9	45.9
2022	58	56.5	43.1
2021	48	56.6	44.2
2020	49	60.3	40.5
2019	23	59.1	46.2
2018	30	60.1	43.6
2017	26	62.9	41.7
2016	63	58.6	40.3
2015	59	57.4	42.0
2014	1	61.9	48.5
2013	55	60.6	39.4
2012	44	58.0	43.5
2011	72	59.4	36.8
2010	31	58.2	45.5
2009	66	57.2	41.2
2008	69	57.6	39.8
2007	75	56.6	38.8
2006	46	61.3	40.1
2005	15	61.3	45.2
2004	29	61.8	42.1
2003	25	59.7	44.9
2000	4	62.2	46.2
1999	43	60.3	41.8
1998	68	57.8	40.4
1997	18	60.7	45.5
1996	9	59.6	48.2
1995	21	59.2	46.6
1994	70	56.2	41.2
1992	56	57.9	42.0
1991	37	60.5	42.3
1990	78	55.4	35.6
1989	10	61.9	45.6
1988	53	59.3	40.9
1987	52	56.8	43.6
1986	33	60.0	43.2
1985	36	58.7	44.1
1984	57	57.5	42.1
1982	24	59.3	45.3
1981	19	59.9	46.3
1980	3	62.9	46.1
1979	11	61.6	45.7
1978	74	56.5	39.4
1977	8	60.7	47.1
1976	22	63.3	42.0
1974	54	57.4	42.8
1973	39	58.0	44.8
1972	71	55.5	40.8
1971	76	54.7	38.7
1970	60	56.9	42.4
1969	6	62.5	45.5
1968	62	55.8	43.3
1967	51	58.1	42.4
1966	45	59.4	42.1
1965	73	56.9	39.2
1964	38	56.8	46.0
1963	32	62.0	41.4
1962	41	57.8	44.4
1961	65	56.5	42.0
1960	14	60.9	45.9
1959	16	62.6	43.9
1958	2	64.6	45.2
1957	20	60.8	45.3
1956	35	61.4	41.6
1954	47	57.2	44.0
1953	61	57.8	41.4
1952	40	56.2	46.5
1951	64	55.5	43.2
1950	7	60.0	48.0
1948	77	52.9	39.8
1947	67	56.9	41.3
1946	42	57.7	44.5
1945	27	58.0	46.0
1944	17	59.5	46.7
1943	34	60.2	42.9
1942	50	57.9	42.7
1941	28	58.1	45.8
1940	5	61.5	46.6
1939	12	61.4	45.6

Weather Station Details

Years	Station	Coordinates
1939–2024	Half Moon Bay	location