KETCHUM RS, IDAHO

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 31.6 37.0 43.7 53.5 62.9 72.1 80.9 79.9 70.1 58.7 42.0 32.3 55.4
Highest Mean Max. Temperature (F) 37.0 47.5 53.1 63.7 70.7 79.3 86.5 84.8 76.1 68.4 51.9 41.0 86.5
Year Highest Occurred 1981 1991 1992 1987 1992 1977 1985 2000 1974 1988 1999 1976 1985
Lowest Mean Max. Temperature (F) 23.8 29.2 38.8 41.8 56.6 63.5 70.2 73.8 61.5 52.0 33.4 23.1 23.1
Year Lowest Occurred 1979 1985 1976 1975 1977 1998 1993 1976 1985 1984 1985 1990 1990
Mean Temperature (F) 17.8 22.2 29.6 38.9 47.4 54.8 61.9 60.3 51.7 41.7 28.2 18.9 39.5
Highest Mean Temperature (F) 22.8 30.7 36.2 44.8 51.4 61.3 67.5 64.2 57.2 49.6 37.0 24.5 67.5
Year Highest Occurred 1986 1991 1992 1987 1997 1977 1985 1971 1998 1988 1999 1975 1985
Lowest Mean Temperature (F) 8.4 13.5 22.3 29.4 42.9 49.1 51.7 55.3 46.4 36.9 20.2 8.0 8.0
Year Lowest Occurred 1979 1985 1976 1975 1991 1993 1993 1975 1985 1984 1994 1990 1990
Mean Min. Temperature (F) 3.9 7.4 15.4 24.2 31.8 37.5 42.8 40.6 33.2 24.7 14.4 5.4 23.4
Highest Mean Min. Temperature (F) 10.1 17.3 21.2 30.8 35.7 43.3 48.5 45.8 41.4 30.8 22.1 11.6 48.5
Year Highest Occurred 1983 1986 1986 2000 1997 1977 1985 1983 1998 1988 1999 1999 1985
Lowest Mean Min. Temperature (F) -7.0 -2.2 5.9 16.8 27.5 31.6 33.1 34.7 28.7 21.1 6.6 -7.1 -7.1
Year Lowest Occurred 1979 1985 1976 1982 1990 1991 1993 1975 1971 1990 1994 1990 1990
Mean Precipitation (in.) 2.25 2.06 1.96 1.23 1.83 1.48 0.86 0.82 1.19 1.13 1.78 2.32 18.91
Highest Precipitation (in.) 5.08 5.07 6.95 3.27 5.46 4.10 2.55 3.16 4.67 2.90 6.07 6.99 6.99
Year Highest Occurred 1995 1986 1995 1978 1998 1993 1977 1976 1985 2000 1973 1996 1996
Lowest Precipitation (in.) 0.05 0.06 0.05 0.01 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.02 0.00
Year Lowest Occurred 1984 1991 1994 1977 1974 1974 1981 1973 1999 1978 1976 1989 1974
Heating Degree Days (F) 1465. 1198. 1098. 785. 548. 316. 151. 178. 401. 722. 1105. 1431. 9398.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 11. 54. 30. 2. 0. 0. 0. 97.

Western Regional Climate Center, wrcc@dri.edu