NAPA STATE HOSPITAL, CALIFORNIA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 56.6 61.8 65.4 70.5 75.4 80.5 82.6 82.4 81.8 76.4 64.1 56.8 71.2
Highest Mean Max. Temperature (F) 62.3 67.7 71.4 77.5 81.8 88.0 86.8 88.0 89.0 81.0 72.5 62.9 89.0
Year Highest Occurred 1996 1991 1988 1987 1997 1981 1988 1998 1984 1990 1995 1999 1984
Lowest Mean Max. Temperature (F) 52.4 57.6 60.4 64.6 68.2 71.9 78.5 76.9 76.0 71.2 58.5 50.0 50.0
Year Lowest Occurred 1982 1989 1991 1975 1998 1982 1994 1980 1986 1972 1985 1972 1972
Mean Temperature (F) 47.9 51.8 54.3 57.6 62.1 66.6 68.6 68.5 67.5 62.7 53.5 47.7 59.1
Highest Mean Temperature (F) 53.0 55.3 58.2 61.7 66.7 72.7 71.5 72.2 71.8 66.0 59.7 53.1 72.7
Year Highest Occurred 1986 1991 1986 1987 1997 1981 1988 1998 1984 1986 1995 1995 1981
Lowest Mean Temperature (F) 43.4 47.1 50.7 52.3 56.9 61.4 66.1 64.8 64.2 59.3 48.7 42.5 42.5
Year Lowest Occurred 1972 1989 1985 1975 1977 1982 1994 1980 1972 1981 1994 1990 1990
Mean Min. Temperature (F) 39.2 41.8 43.1 44.7 48.8 52.6 54.5 54.5 53.1 49.0 42.9 38.6 46.9
Highest Mean Min. Temperature (F) 47.7 46.6 48.4 49.3 52.3 57.4 57.1 57.8 56.3 53.2 49.2 45.4 57.8
Year Highest Occurred 1995 1986 1978 1990 1993 1981 1972 1983 1983 1986 1997 1983 1983
Lowest Mean Min. Temperature (F) 33.7 36.5 38.3 39.9 44.8 48.6 51.9 51.6 50.5 44.6 38.3 30.0 30.0
Year Lowest Occurred 1972 1990 1977 1975 1977 1980 1978 1973 1972 1971 1978 1990 1990
Mean Precipitation (in.) 5.35 5.03 4.09 1.45 0.78 0.16 0.05 0.11 0.41 1.43 3.72 3.88 26.46
Highest Precipitation (in.) 13.66 15.29 11.97 3.97 3.72 1.09 1.05 1.30 2.31 3.64 10.51 12.92 15.29
Year Highest Occurred 1995 1986 1995 1982 1996 1992 1974 1976 1989 1975 1973 1996 1986
Lowest Precipitation (in.) 0.34 0.28 0.13 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.00 0.00
Year Lowest Occurred 1976 1971 1988 1985 1992 1999 2000 2000 1995 1995 1986 1989 1992
Heating Degree Days (F) 529. 370. 335. 231. 133. 49. 9. 13. 31. 105. 347. 537. 2689.
Cooling Degree Days (F) 0. 0. 2. 9. 42. 94. 120. 120. 105. 34. 3. 0. 529.

Western Regional Climate Center, wrcc@dri.edu