BOISE AIR TERMINAL, IDAHO

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 36.4 44.2 52.9 61.4 71.0 80.9 90.2 88.1 77.0 64.6 48.7 37.7 62.8
Highest Mean Max. Temperature (F) 43.5 52.6 59.9 72.2 77.2 89.1 94.4 94.5 86.2 75.2 53.0 44.4 65.8
Year Highest Occurred 1978 1963 1978 1987 1966 1961 1989 1967 1990 1988 1965 1973 1987
Lowest Mean Max. Temperature (F) 25.3 32.1 46.5 53.9 65.1 74.0 84.6 80.8 68.8 57.5 35.9 21.4 57.9
Year Lowest Occurred 1979 1989 1985 1975 1977 1964 1982 1968 1985 1969 1985 1985 1985
Mean Temperature (F) 29.0 35.9 42.4 49.1 57.5 66.5 74.0 72.5 62.6 51.8 39.9 30.1 50.9
Highest Mean Temperature (F) 37.0 43.3 48.7 56.0 62.2 72.9 78.5 78.6 70.9 59.9 44.3 38.4 52.9
Year Highest Occurred 1978 1963 1978 1987 1987 1961 1967 1971 1963 1988 1965 1973 1973
Lowest Mean Temperature (F) 16.2 23.2 36.0 43.8 53.7 61.7 69.4 67.2 56.2 45.9 27.7 12.6 45.8
Year Lowest Occurred 1979 1989 1985 1970 1977 1984 1983 1980 1985 1969 1985 1985 1985
Mean Min. Temperature (F) 21.6 27.5 31.9 36.7 43.9 52.1 57.7 56.8 48.2 39.0 31.1 22.5 39.1
Highest Mean Min. Temperature (F) 30.7 34.0 37.4 41.0 48.7 56.6 62.7 63.1 57.3 46.5 36.1 32.4 41.5
Year Highest Occurred 1970 1983 1978 1990 1963 1961 1967 1971 1963 1963 1970 1973 1973
Lowest Mean Min. Temperature (F) 7.1 14.2 25.4 32.4 40.5 47.3 53.2 50.7 43.5 34.3 19.4 3.7 33.7
Year Lowest Occurred 1979 1989 1985 1968 1982 1976 1981 1980 1961 1969 1985 1985 1985
Mean Precipitation (in.) 1.45 1.07 1.29 1.24 1.08 0.81 0.35 0.43 0.80 0.75 1.48 1.36 12.11
Highest Precipitation (in.) 3.87 3.70 3.46 2.81 4.07 2.00 1.62 2.37 2.93 1.99 3.36 4.23 18.77
Year Highest Occurred 1970 1986 1989 1965 1990 1969 1982 1968 1986 1975 1988 1983 1983
Lowest Precipitation (in.) 0.20 0.19 0.21 0.19 0.10 0.01 0.00 0.00 0.00 0.00 0.14 0.09 6.64
Year Lowest Occurred 1985 1964 1963 1977 1974 1966 1968 1980 1987 1988 1976 1976 1966
Heating Degree Days (F) 1116. 815. 701. 477. 242. 75. 6. 20. 160. 414. 753. 1082. 5861.
Cooling Degree Days (F) 0. 0. 0. 0. 9. 120. 285. 252. 88. 0. 0. 0. 754.

Western Regional Climate Center, wrcc@dri.edu