SWAN VALLEY 2 E, IDAHO

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 29.5 35.4 43.1 54.1 65.0 74.9 84.7 82.8 72.8 60.5 42.6 31.4 56.4
Highest Mean Max. Temperature (F) 36.1 44.7 52.7 66.9 73.9 85.4 92.0 88.6 83.6 70.6 52.1 39.7 60.2
Year Highest Occurred 1981 1963 1986 1987 1969 1988 1989 1990 1990 1988 1962 1962 1990
Lowest Mean Max. Temperature (F) 17.5 29.5 35.9 43.1 57.8 68.8 77.9 76.8 62.8 52.2 34.3 23.7 53.0
Year Lowest Occurred 1979 1985 1964 1975 1975 1964 1982 1968 1986 1984 1985 1978 1975
Mean Temperature (F) 19.4 23.8 31.4 40.7 49.6 57.4 64.6 62.8 54.1 43.8 31.8 21.5 41.7
Highest Mean Temperature (F) 27.3 32.8 40.1 47.3 53.7 64.8 69.6 67.0 62.0 51.3 38.1 28.9 44.0
Year Highest Occurred 1969 1963 1986 1987 1987 1988 1989 1990 1990 1988 1965 1980 1981
Lowest Mean Temperature (F) 6.9 12.7 22.4 32.6 44.3 53.1 61.1 59.5 47.8 38.8 24.5 12.2 39.0
Year Lowest Occurred 1979 1964 1976 1975 1975 1975 1962 1975 1985 1969 1985 1990 1985
Mean Min. Temperature (F) 9.3 12.1 19.6 27.1 34.2 39.9 44.5 42.8 35.3 26.9 21.0 11.5 27.0
Highest Mean Min. Temperature (F) 18.9 21.8 27.4 32.7 40.0 44.1 48.8 51.4 40.7 33.2 27.3 20.7 30.5
Year Highest Occurred 1969 1986 1986 1965 1984 1988 1967 1983 1966 1983 1965 1980 1983
Lowest Mean Min. Temperature (F) -3.8 -7.1 8.6 22.0 30.8 35.8 38.8 38.2 29.6 22.1 14.7 -1.3 23.4
Year Lowest Occurred 1979 1964 1976 1975 1975 1979 1962 1985 1974 1978 1985 1990 1985
Mean Precipitation (in.) 1.47 1.06 1.04 1.48 2.32 1.65 1.25 1.29 1.61 1.15 1.48 1.22 17.02
Highest Precipitation (in.) 4.18 3.18 2.33 3.93 5.81 4.53 3.66 3.47 5.30 2.75 2.94 3.39 23.76
Year Highest Occurred 1970 1968 1989 1986 1987 1964 1973 1968 1961 1967 1983 1964 1983
Lowest Precipitation (in.) 0.23 0.32 0.08 0.26 0.00 0.12 0.04 0.06 0.00 0.00 0.06 0.15 10.66
Year Lowest Occurred 1961 1988 1966 1987 1969 1978 1966 1985 1987 1978 1976 1976 1966
Heating Degree Days (F) 1414. 1154. 1042. 729. 477. 238. 78. 117. 340. 657. 996. 1349. 8591.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 10. 66. 49. 13. 0. 0. 0. 138.

Western Regional Climate Center, wrcc@dri.edu