FOLSOM DAM, CALIFORNIA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 54.5 60.8 65.1 71.5 80.2 88.5 94.8 93.6 88.6 78.6 63.7 55.2 74.6
Highest Mean Max. Temperature (F) 59.5 67.6 71.5 78.7 88.0 94.6 99.6 97.8 94.1 84.8 72.2 62.3 99.6
Year Highest Occurred 1986 1988 1997 1977 1992 1981 1988 1992 1984 1991 1995 1976 1988
Lowest Mean Max. Temperature (F) 49.5 56.6 59.4 64.5 68.9 81.8 88.6 86.7 80.7 71.6 57.8 48.1 48.1
Year Lowest Occurred 1983 1998 1991 1975 1998 1998 1987 1976 1986 1984 1982 1972 1972
Mean Temperature (F) 46.9 51.5 55.0 59.4 66.0 72.7 77.7 76.8 73.4 65.9 54.4 47.1 62.2
Highest Mean Temperature (F) 51.5 55.8 59.3 64.8 71.6 78.1 82.4 79.6 77.5 70.9 60.5 51.3 82.4
Year Highest Occurred 1995 1988 1986 1987 1992 1981 1988 1992 1984 1991 1995 1995 1988
Lowest Mean Temperature (F) 41.9 47.1 50.5 52.8 59.4 67.7 72.4 72.5 67.2 60.6 48.8 40.3 40.3
Year Lowest Occurred 1972 1971 1991 1975 1998 1980 1987 1976 1986 1984 1994 1972 1972
Mean Min. Temperature (F) 39.2 42.2 44.8 47.3 51.8 56.8 60.6 59.9 58.1 53.1 45.0 38.9 49.8
Highest Mean Min. Temperature (F) 46.6 46.3 50.0 51.8 56.2 61.5 65.2 62.2 61.4 58.2 49.6 44.7 65.2
Year Highest Occurred 1995 1980 1978 1989 1997 1981 1988 1990 1998 1987 1981 1983 1988
Lowest Mean Min. Temperature (F) 33.4 36.5 39.3 41.0 46.8 52.7 56.2 55.6 53.7 48.6 39.7 32.5 32.5
Year Lowest Occurred 1975 1971 1977 1975 1971 1980 1987 1985 1986 1971 1994 1972 1972
Mean Precipitation (in.) 4.46 4.34 4.30 1.84 0.52 0.31 0.11 0.10 0.45 1.32 3.47 3.39 24.61
Highest Precipitation (in.) 12.62 12.18 11.46 5.52 3.42 1.26 2.14 1.15 2.63 4.08 9.15 9.33 12.62
Year Highest Occurred 1995 1998 1991 1983 1990 1995 1974 1976 1989 1982 1983 1996 1995
Lowest Precipitation (in.) 0.38 0.23 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00
Year Lowest Occurred 1984 1971 1994 1987 1992 1990 2000 2000 1995 1978 1992 1989 1987
Heating Degree Days (F) 563. 377. 321. 197. 86. 10. 0. 0. 7. 86. 328. 557. 2532.
Cooling Degree Days (F) 0. 0. 8. 30. 116. 240. 392. 363. 258. 113. 8. 0. 1528.

Western Regional Climate Center, wrcc@dri.edu