PORTOLA, CALIFORNIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 41.9 46.5 51.0 58.4 67.8 77.4 85.8 84.5 77.7 66.6 51.0 43.0 62.6
Highest Mean Max. Temperature (F) 51.0 56.3 60.1 67.2 74.2 84.6 90.2 92.0 85.9 74.8 58.5 50.1 65.0
Year Highest Occurred 1961 1963 1972 1977 1969 1977 1984 1981 1974 1988 1976 1976 1981
Lowest Mean Max. Temperature (F) 36.3 37.8 44.8 44.3 58.1 71.6 79.9 77.0 64.9 58.1 44.2 35.2 60.1
Year Lowest Occurred 1989 1989 1962 1967 1977 1980 1987 1976 1986 1984 1985 1990 1989
Mean Temperature (F) 30.0 33.6 37.8 43.0 50.1 57.7 63.3 62.3 56.5 47.9 37.9 31.4 46.0
Highest Mean Temperature (F) 39.5 43.0 44.5 48.3 54.9 63.8 68.5 66.8 61.1 53.3 42.1 38.4 48.6
Year Highest Occurred 1986 1963 1978 1987 1969 1977 1984 1967 1979 1988 1967 1981 1981
Lowest Mean Temperature (F) 23.3 25.8 31.9 34.4 43.9 53.1 58.9 55.8 50.2 42.6 31.2 21.1 43.5
Year Lowest Occurred 1972 1990 1962 1967 1977 1980 1983 1976 1986 1970 1985 1990 1971
Mean Min. Temperature (F) 18.1 20.8 24.6 27.5 32.5 37.9 40.7 40.0 35.2 29.2 24.8 19.8 29.3
Highest Mean Min. Temperature (F) 28.3 29.7 31.6 33.1 37.3 42.9 46.9 45.2 39.4 33.7 30.7 29.1 32.5
Year Highest Occurred 1986 1963 1978 1990 1963 1977 1988 1988 1967 1979 1981 1981 1986
Lowest Mean Min. Temperature (F) 10.2 12.6 18.8 21.3 26.7 30.0 36.0 34.5 28.5 24.7 18.1 7.0 26.1
Year Lowest Occurred 1972 1990 1969 1975 1976 1976 1961 1976 1971 1970 1985 1990 1976
Mean Precipitation (in.) 3.93 3.23 3.08 1.22 0.99 0.71 0.29 0.45 0.70 1.50 3.30 3.33 22.73
Highest Precipitation (in.) 12.05 11.94 8.08 4.57 2.59 2.59 2.25 2.09 2.85 9.70 13.36 10.54 44.78
Year Highest Occurred 1969 1986 1974 1963 1971 1969 1965 1965 1986 1962 1973 1964 1973
Lowest Precipitation (in.) 0.24 0.04 0.23 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.00 9.60
Year Lowest Occurred 1984 1988 1988 1977 1974 1986 1989 1988 1987 1986 1986 1989 1976
Heating Degree Days (F) 1085. 879. 843. 660. 462. 228. 102. 128. 265. 530. 813. 1042. 7037.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 9. 49. 44. 10. 0. 0. 0. 112.

Western Regional Climate Center, wrcc@dri.edu