GRATON, CALIFORNIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 56.2 61.6 64.0 69.4 75.6 80.9 84.2 83.8 82.2 76.0 64.5 56.2 71.2
Highest Mean Max. Temperature (F) 61.1 68.0 72.2 75.7 81.8 91.2 89.1 89.7 91.8 82.8 71.6 62.8 73.5
Year Highest Occurred 1976 1988 1988 1987 1984 1981 1989 1969 1984 1990 1986 1976 1984
Lowest Mean Max. Temperature (F) 50.0 55.2 59.0 57.4 68.6 71.7 80.4 78.7 74.2 68.9 57.7 48.3 67.1
Year Lowest Occurred 1961 1962 1962 1967 1961 1965 1965 1980 1965 1962 1964 1963 1963
Mean Temperature (F) 45.6 49.5 51.5 54.7 59.5 64.0 66.1 66.1 64.7 59.8 51.8 45.7 56.6
Highest Mean Temperature (F) 50.1 54.5 56.5 58.5 63.5 70.4 69.5 68.6 69.9 63.3 55.6 50.2 58.2
Year Highest Occurred 1986 1963 1978 1985 1984 1981 1988 1983 1984 1987 1976 1969 1983
Lowest Mean Temperature (F) 41.7 45.3 48.5 46.7 55.5 59.0 63.3 63.3 59.8 56.2 48.8 41.2 55.0
Year Lowest Occurred 1963 1989 1964 1967 1964 1965 1962 1973 1965 1971 1985 1965 1965
Mean Min. Temperature (F) 35.0 37.4 38.8 40.0 43.3 47.0 48.0 48.4 47.1 43.5 39.0 35.2 41.9
Highest Mean Min. Temperature (F) 41.5 45.2 44.7 44.6 47.6 50.0 50.8 51.6 52.0 48.1 44.3 42.5 44.8
Year Highest Occurred 1986 1963 1978 1990 1963 1969 1990 1990 1983 1963 1970 1983 1983
Lowest Mean Min. Temperature (F) 29.4 32.1 34.4 34.4 40.8 43.6 45.6 44.2 41.3 36.3 33.0 26.0 39.7
Year Lowest Occurred 1976 1989 1964 1970 1974 1980 1989 1969 1970 1971 1990 1990 1971
Mean Precipitation (in.) 8.96 6.27 5.60 2.29 0.51 0.20 0.09 0.12 0.51 2.36 6.49 7.12 40.52
Highest Precipitation (in.) 22.59 21.54 20.38 8.06 6.01 2.28 1.93 0.93 2.29 10.90 16.34 16.52 84.65
Year Highest Occurred 1970 1986 1983 1963 1990 1967 1974 1976 1989 1962 1973 1969 1983
Lowest Precipitation (in.) 0.42 0.28 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.26 0.00 13.51
Year Lowest Occurred 1976 1971 1988 1968 1982 1990 1990 1990 1988 1978 1986 1989 1976
Heating Degree Days (F) 601. 434. 419. 314. 181. 83. 33. 30. 78. 171. 396. 598. 3338.
Cooling Degree Days (F) 0. 0. 0. 5. 10. 53. 67. 64. 69. 9. 0. 0. 277.

Western Regional Climate Center, wrcc@dri.edu