FORT BENTON, MONTANA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 32.3 39.8 48.2 60.4 69.9 78.7 86.1 84.7 73.1 63.3 46.2 34.6 59.8
Highest Mean Max. Temperature (F) 47.4 53.9 59.3 70.4 77.2 88.8 93.5 92.5 83.9 69.1 55.1 47.2 64.9
Year Highest Occurred 1986 1977 1986 1987 1988 1988 1985 1971 1990 1965 1981 1979 1987
Lowest Mean Max. Temperature (F) 4.7 22.0 33.7 46.7 64.2 72.4 80.9 77.1 58.4 52.1 24.9 11.5 55.1
Year Lowest Occurred 1969 1989 1965 1975 1974 1967 1972 1974 1965 1969 1985 1983 1978
Mean Temperature (F) 20.5 27.1 34.9 45.8 55.4 63.6 69.2 67.8 56.9 47.7 33.3 22.9 45.4
Highest Mean Temperature (F) 36.3 39.3 45.6 52.7 60.9 72.6 74.6 73.5 63.7 53.1 40.0 32.5 49.3
Year Highest Occurred 1986 1977 1986 1987 1988 1988 1985 1971 1990 1963 1981 1974 1988
Lowest Mean Temperature (F) -4.7 11.7 21.0 35.0 50.6 59.7 65.0 62.6 47.4 39.5 14.7 0.7 41.7
Year Lowest Occurred 1969 1989 1965 1975 1974 1981 1972 1980 1965 1969 1985 1983 1969
Mean Min. Temperature (F) 8.6 14.2 21.6 31.2 40.8 48.5 52.3 50.9 40.7 32.0 20.2 11.1 31.0
Highest Mean Min. Temperature (F) 25.2 24.6 31.9 36.1 44.6 56.4 55.9 55.0 45.7 37.1 26.7 19.9 34.5
Year Highest Occurred 1986 1977 1986 1980 1988 1988 1975 1972 1966 1963 1989 1962 1988
Lowest Mean Min. Temperature (F) -14.0 1.3 8.3 23.3 36.9 45.0 49.1 46.8 36.4 26.3 4.4 -10.2 26.4
Year Lowest Occurred 1969 1969 1965 1975 1974 1981 1972 1977 1965 1972 1985 1983 1969
Mean Precipitation (in.) 0.70 0.46 0.91 1.21 2.51 2.51 1.29 1.45 1.29 0.80 0.58 0.67 14.38
Highest Precipitation (in.) 2.38 0.98 3.32 3.25 6.83 7.07 3.62 4.85 3.46 2.22 1.67 1.86 25.79
Year Highest Occurred 1969 1980 1981 1975 1981 1975 1983 1985 1978 1975 1966 1977 1975
Lowest Precipitation (in.) 0.00 0.02 0.16 0.05 0.75 0.22 0.01 0.01 0.08 0.03 0.02 0.07 9.11
Year Lowest Occurred 1973 1990 1963 1981 1973 1985 1984 1967 1966 1987 1972 1987 1987
Heating Degree Days (F) 1380. 1061. 933. 576. 303. 120. 18. 64. 272. 536. 951. 1305. 7519.
Cooling Degree Days (F) 0. 0. 0. 0. 6. 78. 149. 151. 29. 0. 0. 0. 413.

Western Regional Climate Center, wrcc@dri.edu