SANTA ROSA, CALIFORNIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 57.7 62.8 65.3 70.2 75.3 80.6 83.8 83.6 83.1 77.3 65.6 57.5 71.9
Highest Mean Max. Temperature (F) 63.1 68.0 71.1 76.3 82.2 89.3 89.6 91.7 89.6 84.3 70.7 64.0 74.8
Year Highest Occurred 1976 1977 1972 1966 1978 1981 1961 1969 1970 1978 1976 1976 1978
Lowest Mean Max. Temperature (F) 52.2 56.6 58.6 61.3 68.4 73.7 74.7 74.0 71.5 71.2 58.4 52.0 66.8
Year Lowest Occurred 1985 1969 1985 1967 1985 1982 1987 1986 1986 1984 1985 1985 1985
Mean Temperature (F) 47.4 51.5 53.3 56.5 60.9 65.5 67.6 67.7 67.0 62.2 53.7 47.6 58.4
Highest Mean Temperature (F) 51.1 56.4 58.1 61.1 65.0 72.8 70.2 70.8 71.5 66.0 57.6 52.1 60.2
Year Highest Occurred 1984 1963 1984 1989 1984 1981 1961 1969 1984 1983 1967 1977 1981
Lowest Mean Temperature (F) 43.1 47.9 49.1 49.7 56.6 61.4 62.0 61.6 60.4 58.9 48.6 42.9 55.3
Year Lowest Occurred 1985 1989 1985 1967 1985 1965 1987 1986 1986 1971 1985 1985 1985
Mean Min. Temperature (F) 37.0 40.1 41.2 42.8 46.4 50.4 51.2 51.7 51.0 47.0 41.8 37.6 44.9
Highest Mean Min. Temperature (F) 42.9 46.7 46.6 49.7 50.9 56.2 55.1 55.6 56.6 51.9 46.9 44.9 48.5
Year Highest Occurred 1970 1968 1989 1990 1984 1981 1988 1990 1983 1983 1981 1983 1983
Lowest Mean Min. Temperature (F) 31.8 33.2 35.4 37.4 43.7 47.9 48.3 49.0 47.5 40.4 37.3 31.6 42.9
Year Lowest Occurred 1963 1964 1964 1970 1964 1980 1962 1973 1970 1971 1975 1976 1964
Mean Precipitation (in.) 6.45 4.72 4.19 1.86 0.48 0.18 0.06 0.15 0.50 1.98 4.64 5.09 30.30
Highest Precipitation (in.) 15.89 15.94 15.74 6.72 5.46 1.94 1.61 1.68 2.75 9.47 13.23 11.79 63.07
Year Highest Occurred 1970 1986 1983 1967 1990 1967 1974 1968 1986 1962 1973 1969 1983
Lowest Precipitation (in.) 0.39 0.19 0.02 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 11.38
Year Lowest Occurred 1976 1971 1988 1970 1982 1986 1990 1990 1988 1978 1977 1989 1976
Heating Degree Days (F) 546. 378. 363. 263. 147. 70. 27. 38. 55. 118. 339. 539. 2883.
Cooling Degree Days (F) 0. 0. 0. 8. 20. 85. 108. 122. 115. 31. 0. 0. 489.

Western Regional Climate Center, wrcc@dri.edu