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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) 24.0 29.0 40.3 55.9 69.4 78.2 83.0 79.7 70.6 59.3 42.9 28.4 55.1
Highest Mean Max. Temperature (F) 38.1 38.1 50.0 62.0 79.5 84.3 88.2 84.6 74.2 70.9 49.2 35.4 58.6
Year Highest Occurred 1990 1987 1968 1963 1977 1988 1966 1988 1978 1963 1975 1979 1987
Lowest Mean Max. Temperature (F) 13.9 21.4 33.0 47.7 61.2 68.8 77.8 75.6 65.4 53.2 36.9 19.0 52.5
Year Lowest Occurred 1963 1979 1965 1975 1983 1969 1978 1979 1975 1980 1985 1983 1979
Mean Temperature (F) 14.4 18.5 30.7 45.0 57.1 66.0 71.1 68.2 59.5 48.6 34.3 20.0 44.5
Highest Mean Temperature (F) 27.9 29.3 39.1 50.3 64.9 70.2 74.8 73.2 63.3 57.3 39.3 28.2 48.5
Year Highest Occurred 1990 1984 1973 1985 1977 1988 1983 1988 1978 1963 1975 1987 1987
Lowest Mean Temperature (F) 4.0 10.4 24.0 38.4 51.1 58.2 67.1 63.1 54.9 43.4 27.5 10.8 42.2
Year Lowest Occurred 1977 1979 1965 1975 1967 1969 1967 1967 1975 1987 1976 1983 1972
Mean Min. Temperature (F) 4.7 8.1 21.1 34.0 44.7 53.7 59.2 56.6 48.2 37.9 25.7 11.5 33.8
Highest Mean Min. Temperature (F) 17.7 21.3 30.5 39.2 50.6 57.9 63.6 61.9 52.3 46.8 30.4 22.1 38.4
Year Highest Occurred 1990 1984 1973 1986 1982 1987 1987 1983 1978 1971 1987 1987 1987
Lowest Mean Min. Temperature (F) -6.6 -1.0 15.0 29.0 38.3 47.6 53.9 49.6 43.4 32.8 17.8 0.5 31.1
Year Lowest Occurred 1977 1967 1969 1975 1967 1969 1967 1967 1974 1976 1976 1985 1967
Mean Precipitation (in.) 1.18 1.04 2.26 2.79 3.78 3.73 4.01 3.76 4.07 2.46 2.20 1.54 32.82
Highest Precipitation (in.) 3.71 3.28 5.06 5.16 9.18 9.55 7.99 7.37 9.86 4.81 5.14 3.94 40.91
Year Highest Occurred 1969 1981 1973 1965 1973 1967 1982 1980 1986 1967 1985 1968 1965
Lowest Precipitation (in.) 0.11 0.00 0.17 0.80 0.99 0.72 1.67 0.64 0.41 0.23 0.00 0.23 21.37
Year Lowest Occurred 1981 1969 1978 1989 1981 1988 1975 1969 1976 1966 1976 1989 1966
Heating Degree Days (F) 1569. 1302. 1063. 600. 280. 67. 10. 30. 176. 508. 921. 1395. 7921.
Cooling Degree Days (F) 0. 0. 0. 0. 35. 97. 199. 129. 11. 0. 0. 0. 471.

Western Regional Climate Center, wrcc@dri.edu