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NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 24.7 30.3 42.5 57.9 70.7 79.4 83.6 81.1 72.1 60.9 44.2 29.3 56.4
Highest Mean Max. Temperature (F) 37.2 40.2 52.7 66.3 79.3 86.0 87.5 87.1 76.7 73.2 50.8 37.9 59.8
Year Highest Occurred 1990 1987 1968 1977 1977 1988 1988 1983 1978 1963 1990 1965 1987
Lowest Mean Max. Temperature (F) 12.8 22.7 32.8 50.6 63.9 71.2 79.4 76.9 66.7 55.5 36.1 17.1 53.3
Year Lowest Occurred 1977 1979 1965 1975 1983 1969 1971 1977 1965 1988 1985 1983 1972
Mean Temperature (F) 15.9 20.9 33.6 47.9 59.8 68.7 73.2 70.8 62.2 51.3 36.5 21.7 46.9
Highest Mean Temperature (F) 29.2 31.2 41.7 54.3 66.6 73.2 77.1 76.9 66.3 61.8 41.9 31.0 50.9
Year Highest Occurred 1990 1987 1973 1977 1977 1987 1983 1983 1978 1963 1990 1965 1987
Lowest Mean Temperature (F) 2.3 11.6 25.3 41.3 55.2 61.2 68.8 66.9 58.0 45.3 28.7 10.2 43.9
Year Lowest Occurred 1977 1978 1965 1975 1983 1969 1971 1967 1974 1976 1976 1983 1972
Mean Min. Temperature (F) 7.0 11.4 24.6 37.8 48.9 58.0 62.9 60.5 52.3 41.7 28.7 14.0 37.3
Highest Mean Min. Temperature (F) 21.2 22.6 33.2 44.2 56.3 63.0 67.1 66.7 56.0 50.3 33.6 24.1 41.8
Year Highest Occurred 1990 1983 1973 1985 1962 1971 1983 1983 1985 1963 1963 1965 1987
Lowest Mean Min. Temperature (F) -8.2 -0.1 15.5 32.0 43.9 51.1 58.2 55.9 47.2 34.6 18.6 1.0 34.4
Year Lowest Occurred 1977 1978 1969 1975 1966 1969 1971 1967 1976 1976 1976 1985 1972
Mean Precipitation (in.) 0.75 0.79 1.78 3.17 3.28 3.84 4.26 3.89 3.86 2.35 1.86 1.19 31.02
Highest Precipitation (in.) 2.61 2.25 3.81 6.86 6.58 9.18 10.50 11.38 11.92 5.48 4.58 3.28 40.46
Year Highest Occurred 1969 1971 1961 1973 1973 1968 1987 1980 1965 1984 1982 1982 1965
Lowest Precipitation (in.) 0.06 0.06 0.31 1.32 1.52 1.34 0.45 0.55 0.70 0.26 0.04 0.15 19.37
Year Lowest Occurred 1962 1987 1978 1961 1988 1988 1967 1970 1975 1964 1976 1962 1976
Heating Degree Days (F) 1522. 1235. 973. 513. 209. 34. 0. 14. 109. 433. 855. 1342. 7239.
Cooling Degree Days (F) 0. 0. 0. 0. 47. 145. 259. 193. 25. 8. 0. 0. 677.
Western Regional Climate Center, wrcc@dri.edu