HALF MOON BAY, CALIFORNIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 58.2 59.2 58.9 59.5 60.4 62.3 63.5 65.1 66.4 65.4 62.0 58.1 61.6
Highest Mean Max. Temperature (F) 61.7 64.4 63.5 64.1 64.7 65.6 66.5 68.9 72.5 70.7 67.6 62.8 63.3
Year Highest Occurred 1961 1964 1978 1966 1970 1981 1988 1983 1983 1965 1989 1976 1983
Lowest Mean Max. Temperature (F) 53.0 51.6 55.6 53.4 57.4 58.1 59.2 60.9 61.7 61.3 57.6 54.2 58.7
Year Lowest Occurred 1969 1969 1975 1975 1969 1969 1971 1969 1975 1975 1985 1971 1975
Mean Temperature (F) 50.3 51.3 51.4 51.8 53.8 56.1 57.4 58.9 58.9 57.0 53.7 50.4 54.3
Highest Mean Temperature (F) 54.1 54.8 56.2 55.0 55.8 59.2 59.7 62.6 63.5 60.7 58.1 54.0 56.4
Year Highest Occurred 1961 1980 1978 1989 1987 1961 1988 1983 1983 1983 1989 1980 1983
Lowest Mean Temperature (F) 46.8 45.6 49.1 48.2 51.2 53.7 53.3 54.2 56.3 52.3 50.2 45.7 52.1
Year Lowest Occurred 1972 1989 1985 1975 1966 1971 1971 1969 1975 1971 1985 1990 1971
Mean Min. Temperature (F) 42.5 43.4 43.9 44.1 47.0 49.8 51.3 52.7 51.3 48.5 45.3 42.7 46.9
Highest Mean Min. Temperature (F) 47.1 49.0 48.9 46.6 51.1 53.1 53.7 56.7 54.8 52.2 48.9 46.6 49.6
Year Highest Occurred 1970 1968 1978 1989 1987 1961 1983 1961 1967 1972 1967 1977 1983
Lowest Mean Min. Temperature (F) 37.8 37.4 40.9 39.7 41.5 46.6 47.0 46.5 46.0 42.5 40.7 35.9 44.0
Year Lowest Occurred 1972 1989 1976 1970 1966 1971 1970 1970 1970 1971 1971 1990 1971
Mean Precipitation (in.) 5.02 3.82 4.14 1.95 0.47 0.22 0.12 0.21 0.43 2.00 3.77 4.17 26.32
Highest Precipitation (in.) 12.01 11.48 13.05 7.43 2.82 1.44 1.01 1.56 2.20 10.97 9.86 9.46 55.01
Year Highest Occurred 1982 1986 1983 1967 1990 1967 1974 1976 1986 1962 1984 1983 1983
Lowest Precipitation (in.) 0.26 0.25 0.12 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.03 13.13
Year Lowest Occurred 1984 1967 1988 1985 1982 1981 1987 1978 1987 1966 1986 1989 1976
Heating Degree Days (F) 456. 384. 422. 396. 347. 267. 236. 195. 186. 252. 339. 453. 3933.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 0. 0. 6. 0. 0. 0. 0. 6.

Western Regional Climate Center, wrcc@dri.edu