HEADQUARTERS, IDAHO

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 34.6 40.1 45.6 54.1 63.4 72.6 81.2 81.5 70.8 58.6 42.6 34.4 56.6
Highest Mean Max. Temperature (F) 41.4 47.0 52.8 65.3 72.3 81.7 89.2 90.5 81.1 68.1 47.9 38.8 59.8
Year Highest Occurred 1981 1963 1978 1987 1966 1961 1985 1961 1967 1988 1965 1980 1987
Lowest Mean Max. Temperature (F) 26.0 34.7 39.4 45.8 55.6 65.2 75.1 73.7 62.1 52.4 31.8 26.6 53.4
Year Lowest Occurred 1979 1985 1976 1970 1978 1975 1983 1975 1985 1969 1985 1990 1975
Mean Temperature (F) 25.6 29.6 34.3 41.3 48.9 57.2 62.8 62.4 53.3 43.9 33.4 26.0 43.2
Highest Mean Temperature (F) 32.7 34.8 40.2 47.8 53.8 62.1 68.1 67.8 60.4 50.1 37.5 31.7 45.4
Year Highest Occurred 1981 1963 1978 1987 1966 1986 1985 1961 1966 1988 1965 1966 1981
Lowest Mean Temperature (F) 14.2 19.4 29.5 35.7 45.1 52.0 58.2 56.6 46.5 39.4 23.0 17.4 41.2
Year Lowest Occurred 1979 1989 1976 1975 1975 1976 1963 1964 1971 1971 1985 1990 1985
Mean Min. Temperature (F) 16.5 19.0 23.0 28.5 34.4 41.8 44.4 43.3 35.8 29.2 24.2 17.5 29.8
Highest Mean Min. Temperature (F) 26.4 27.8 29.6 32.9 38.2 46.8 51.1 49.6 41.2 32.3 28.6 26.2 33.1
Year Highest Occurred 1967 1961 1983 1981 1981 1970 1975 1983 1966 1975 1966 1966 1981
Lowest Mean Min. Temperature (F) 2.3 3.9 15.8 24.7 30.5 37.4 39.7 37.6 28.9 23.8 14.2 8.1 27.0
Year Lowest Occurred 1979 1989 1965 1975 1989 1962 1963 1988 1971 1971 1985 1990 1989
Mean Precipitation (in.) 5.38 3.76 3.65 3.08 3.01 2.53 1.17 1.44 2.02 2.78 4.52 4.89 38.23
Highest Precipitation (in.) 10.08 8.47 6.37 5.37 5.57 6.35 3.27 4.18 4.99 6.33 10.55 12.57 51.12
Year Highest Occurred 1970 1972 1966 1961 1984 1981 1983 1976 1985 1967 1973 1964 1971
Lowest Precipitation (in.) 0.93 1.73 1.14 0.22 0.58 0.28 0.00 0.00 0.14 0.00 1.08 0.57 20.62
Year Lowest Occurred 1985 1964 1985 1977 1966 1986 1985 1986 1979 1978 1969 1985 1987
Heating Degree Days (F) 1221. 991. 952. 711. 499. 246. 110. 139. 365. 654. 948. 1209. 8045.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 12. 41. 58. 14. 0. 0. 0. 125.

Western Regional Climate Center, wrcc@dri.edu