Half Moon Bay December Weather

Averages and records for weather in Half Moon Bay, California in the month of December.
Typical Half Moon Bay December Weather
1991–2020
Average daily high 59.5 °F
Average daily low 42.8 °F
Average monthly precipitation 4.7 inches
Average monthly snow none
Daily chance of precipitation 43.2%
Daily chance of snow 0%
Half Moon Bay December Weather Records
1939–2024
Highest temperature 79 °F December 4, 1958
Lowest temperature 19 °F December 23, 1990
Highest daily low 60 °F December 24, 1989
Lowest daily high 37 °F December 9, 1972
Hottest average high temperature 64.6 °F 1958
Coldest average high temperature 52.9 °F 1948
Most daily precipitation 5.5 inches December 16, 2002
Most monthly precipitation 12.7 inches 1955
Most daily snow none -
Most monthly snow none -
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
December 1 60.8 43.6 75 34
December 2 60.7 43.5 75 32
December 3 60.6 43.5 75 34
December 4 60.5 43.4 79 27
December 5 60.4 43.3 72 28
December 6 60.3 43.2 69 31
December 7 60.2 43.2 72 32
December 8 60.1 43.2 72 28
December 9 59.9 43.1 70 27
December 10 59.9 43.1 70 29
December 11 59.8 43.0 73 29
December 12 59.8 42.9 73 31
December 13 59.8 42.9 75 31
December 14 59.7 42.8 70 30
December 15 59.6 42.7 73 34
December 16 59.5 42.7 72 33
December 17 59.4 42.7 72 31
December 18 59.4 42.6 68 29
December 19 59.3 42.6 72 29
December 20 59.3 42.6 71 25
December 21 59.2 42.6 72 24
December 22 59.2 42.6 71 24
December 23 59.2 42.5 69 19
December 24 59.1 42.5 71 28
December 25 59.1 42.5 74 29
December 26 59.1 42.5 74 31
December 27 59.1 42.4 72 29
December 28 59.1 42.4 70 28
December 29 59.1 42.4 71 30
December 30 59.2 42.5 69 32
December 31 59.2 42.5 70 31
Weather Station Details
Years Station Coordinates
1939–2024 Half Moon Bay location