HETCH HETCHY, CALIFORNIA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 48.0 52.5 56.1 62.1 69.2 77.8 84.6 84.7 79.3 70.2 55.9 47.9 65.7
Highest Mean Max. Temperature (F) 54.9 62.0 65.7 70.9 76.3 82.9 89.5 88.6 84.6 79.2 66.0 55.8 89.5
Year Highest Occurred 1986 1991 1997 1987 1992 1981 1988 1994 1974 1988 1995 1976 1988
Lowest Mean Max. Temperature (F) 41.5 43.5 47.2 51.8 56.8 69.9 79.6 76.1 70.9 63.1 43.3 40.0 40.0
Year Lowest Occurred 1982 1998 1991 1975 1998 1998 1983 1976 1986 1984 1994 1971 1971
Mean Temperature (F) 39.2 42.0 44.9 50.0 56.6 64.2 70.4 70.4 65.3 56.7 45.3 39.1 53.7
Highest Mean Temperature (F) 44.6 49.0 52.3 56.5 64.0 69.7 75.3 73.8 69.7 63.5 53.2 44.3 75.3
Year Highest Occurred 1986 1995 1997 1987 1992 2000 1988 1994 1991 1988 1995 2000 1988
Lowest Mean Temperature (F) 33.8 35.1 37.6 41.1 47.9 59.1 64.6 63.3 58.4 50.3 36.7 32.0 32.0
Year Lowest Occurred 1982 1990 1991 1975 1977 1998 1983 1976 1986 1984 1994 1971 1971
Mean Min. Temperature (F) 30.3 31.4 33.7 37.8 44.0 50.6 56.2 56.0 51.2 43.1 34.6 30.2 41.6
Highest Mean Min. Temperature (F) 35.9 37.3 39.9 43.7 51.6 57.1 61.0 59.7 55.7 49.2 40.3 36.0 61.0
Year Highest Occurred 2000 1995 1993 1989 1992 2000 1988 2000 1991 1987 1995 2000 1988
Lowest Mean Min. Temperature (F) 25.3 25.7 27.8 30.4 37.6 45.9 49.5 49.9 45.9 37.4 30.0 23.6 23.6
Year Lowest Occurred 1989 1990 1977 1975 1977 1980 1983 1999 1986 1971 1994 1990 1990
Mean Precipitation (in.) 6.38 6.10 5.82 2.99 1.77 0.82 0.28 0.21 0.95 2.20 4.44 4.63 36.59
Highest Precipitation (in.) 16.76 17.06 16.89 9.40 7.14 2.53 3.56 1.70 4.22 6.68 14.05 15.34 17.06
Year Highest Occurred 1997 1986 1995 1978 1998 1998 1992 1975 1978 1975 1983 1996 1986
Lowest Precipitation (in.) 0.21 0.70 0.23 0.29 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Year Lowest Occurred 1984 1997 1972 1977 1985 1994 2000 1998 1995 1995 1995 1989 1994
Heating Degree Days (F) 802. 646. 623. 458. 292. 100. 20. 20. 91. 290. 593. 805. 4740.
Cooling Degree Days (F) 0. 0. 0. 7. 31. 75. 188. 186. 100. 31. 1. 0. 619.

Western Regional Climate Center, wrcc@dri.edu