GRATON, CALIFORNIA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 57.0 61.7 64.9 70.2 75.8 81.2 83.6 83.8 82.4 77.0 65.5 57.5 71.7
Highest Mean Max. Temperature (F) 61.0 68.0 72.2 76.0 81.8 91.2 89.1 87.8 91.8 82.8 72.0 63.1 91.8
Year Highest Occurred 1976 1988 1988 1987 1984 1981 1989 1994 1984 1990 1995 1999 1984
Lowest Mean Max. Temperature (F) 53.6 56.4 59.6 63.2 67.2 73.3 79.5 78.7 74.5 69.8 60.0 50.9 50.9
Year Lowest Occurred 1985 1998 1991 1975 1998 1998 1994 1980 1986 1972 1994 1972 1972
Mean Temperature (F) 46.4 49.9 52.5 55.8 60.2 64.4 66.5 66.4 65.1 60.1 51.8 45.9 57.1
Highest Mean Temperature (F) 50.1 53.3 56.9 58.5 63.7 71.2 69.5 68.6 69.9 63.3 56.9 50.0 71.2
Year Highest Occurred 1986 1995 1978 1985 1997 1981 1988 1983 1984 1987 1995 1996 1981
Lowest Mean Temperature (F) 42.8 45.3 48.5 50.2 56.2 61.5 63.5 63.4 60.8 55.8 46.7 41.3 41.3
Year Lowest Occurred 1982 1989 1999 1975 1998 1991 2000 1973 1986 1971 1994 1972 1972
Mean Min. Temperature (F) 35.7 38.1 40.1 41.4 44.5 47.6 49.3 49.0 47.7 43.1 38.0 34.3 42.4
Highest Mean Min. Temperature (F) 45.0 43.4 45.7 44.6 47.7 51.2 51.5 51.6 52.1 48.0 43.7 42.5 52.1
Year Highest Occurred 1995 1995 1978 1990 1993 1981 1992 1990 1983 1987 1997 1983 1983
Lowest Mean Min. Temperature (F) 29.5 32.1 35.5 37.1 41.5 43.9 45.6 45.8 44.6 35.7 33.0 26.0 26.0
Year Lowest Occurred 1976 1989 1977 1975 1999 1991 1989 1994 1972 1971 1990 1990 1990
Mean Precipitation (in.) 8.65 7.64 6.15 2.25 1.03 0.25 0.08 0.11 0.52 2.01 5.85 6.29 40.83
Highest Precipitation (in.) 23.58 24.84 20.38 5.62 6.01 1.77 1.93 1.44 2.29 5.26 16.34 15.66 24.84
Year Highest Occurred 1995 1998 1983 1983 1990 1992 1974 1997 1989 1979 1973 1983 1998
Lowest Precipitation (in.) 0.42 0.28 0.01 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.26 0.00 0.00
Year Lowest Occurred 1976 1971 1988 1973 1992 1996 2000 2000 1995 1995 1986 1989 1992
Heating Degree Days (F) 579. 422. 389. 278. 166. 70. 25. 26. 65. 169. 398. 592. 3179.
Cooling Degree Days (F) 0. 0. 0. 1. 15. 52. 70. 69. 65. 16. 0. 0. 288.

Western Regional Climate Center, wrcc@dri.edu