CHELAN, WASHINGTON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 32.7 39.8 51.1 61.4 70.3 77.2 84.4 84.9 74.9 61.2 43.9 33.6 59.6
Highest Mean Max. Temperature (F) 40.3 45.7 55.2 67.2 75.6 83.0 96.2 91.1 82.6 66.4 49.3 41.9 96.2
Year Highest Occurred 1990 1991 1981 1977 1993 1986 1985 1977 1998 1988 1990 1999 1985
Lowest Mean Max. Temperature (F) 22.6 31.3 45.0 57.6 65.5 71.2 76.1 77.9 69.6 57.6 32.4 23.9 22.6
Year Lowest Occurred 1979 1985 1971 1972 1984 1991 1993 1995 1986 1984 1985 1984 1979
Mean Temperature (F) 27.3 33.0 41.9 50.9 59.4 66.4 72.5 72.6 63.1 50.9 37.9 28.8 50.4
Highest Mean Temperature (F) 35.1 39.2 45.3 55.0 64.3 72.2 79.4 77.2 69.2 55.9 43.4 36.6 79.4
Year Highest Occurred 1981 1991 1992 1990 1993 1992 1985 1986 1998 1988 1999 1999 1985
Lowest Mean Temperature (F) 16.7 24.0 36.5 47.3 55.8 61.9 66.8 67.3 58.4 47.5 25.1 19.4 16.7
Year Lowest Occurred 1979 1985 1971 1972 1996 1991 1993 1995 1972 1984 1985 1984 1979
Mean Min. Temperature (F) 21.9 26.1 32.7 40.3 48.4 55.6 60.6 60.3 51.2 40.5 31.9 24.0 41.1
Highest Mean Min. Temperature (F) 30.8 33.8 36.3 44.8 52.9 61.8 65.5 64.0 55.8 45.4 37.7 31.2 65.5
Year Highest Occurred 1981 1992 1987 1990 1993 1992 1998 1986 1998 1988 1999 1999 1998
Lowest Mean Min. Temperature (F) 10.8 16.7 28.0 36.0 45.2 51.3 55.9 55.7 47.2 37.1 17.8 15.0 10.8
Year Lowest Occurred 1979 1985 1971 1982 1996 1976 1972 1980 1972 1972 1985 1984 1979
Mean Precipitation (in.) 1.57 1.23 0.99 0.70 0.82 0.81 0.38 0.44 0.46 0.59 1.61 1.74 11.34
Highest Precipitation (in.) 3.98 2.63 3.28 1.91 2.86 3.17 1.56 2.39 2.39 1.96 6.20 4.65 6.20
Year Highest Occurred 1995 1981 1983 1975 1998 1984 1998 1975 1986 1997 1983 1996 1983
Lowest Precipitation (in.) 0.10 0.05 0.13 0.00 0.04 0.07 0.00 0.00 0.00 0.00 0.12 0.21 0.00
Year Lowest Occurred 1977 1988 1976 2000 1992 1976 1994 2000 1994 1978 1993 1989 2000
Heating Degree Days (F) 1168. 897. 716. 425. 191. 73. 16. 12. 125. 439. 813. 1122. 5997.
Cooling Degree Days (F) 0. 0. 0. 0. 16. 115. 248. 247. 67. 0. 0. 0. 693.

Western Regional Climate Center, wrcc@dri.edu