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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) 20.6 24.8 34.9 47.6 59.7 69.7 77.0 75.1 66.1 54.9 39.2 25.8 49.6
Highest Mean Max. Temperature (F) 30.7 35.8 41.6 58.8 72.4 81.9 86.2 80.5 71.5 66.8 45.7 32.1 55.1
Year Highest Occurred 1990 1987 1987 1987 1988 1988 1988 1961 1989 1963 1963 1979 1987
Lowest Mean Max. Temperature (F) 10.5 14.4 28.9 40.3 52.3 62.6 72.3 70.2 59.3 48.3 32.9 15.5 45.7
Year Lowest Occurred 1979 1979 1972 1975 1979 1969 1972 1982 1965 1988 1985 1983 1972
Mean Temperature (F) 11.7 14.4 25.0 37.7 48.4 57.9 65.7 64.4 56.0 45.8 32.1 19.0 39.8
Highest Mean Temperature (F) 21.6 26.9 32.7 45.0 56.6 65.6 72.4 68.5 60.4 55.5 37.6 26.9 45.2
Year Highest Occurred 1990 1987 1987 1987 1988 1988 1988 1961 1990 1963 1963 1987 1987
Lowest Mean Temperature (F) 0.4 2.8 18.0 32.6 42.3 52.5 62.1 59.9 51.0 39.7 25.7 7.9 36.1
Year Lowest Occurred 1977 1979 1984 1975 1979 1969 1962 1977 1974 1976 1985 1983 1972
Mean Min. Temperature (F) 2.8 3.9 15.1 27.8 37.0 46.0 54.2 53.7 45.9 36.7 25.0 12.2 30.0
Highest Mean Min. Temperature (F) 13.1 18.4 23.8 33.6 42.0 51.1 58.6 56.8 50.2 44.2 29.5 21.8 35.1
Year Highest Occurred 1987 1984 1987 1986 1964 1987 1988 1984 1990 1963 1962 1987 1987
Lowest Mean Min. Temperature (F) -10.1 -8.8 6.7 23.1 32.3 40.9 50.7 49.0 40.1 30.1 18.2 0.3 26.5
Year Lowest Occurred 1977 1979 1984 1972 1979 1982 1971 1977 1976 1976 1976 1983 1972
Mean Precipitation (in.) 1.50 1.11 2.02 2.36 3.67 4.06 3.38 4.28 3.65 2.74 2.06 1.72 32.55
Highest Precipitation (in.) 4.01 3.40 5.90 4.72 10.00 9.57 10.44 10.06 9.56 5.71 6.50 3.61 49.28
Year Highest Occurred 1975 1971 1967 1984 1964 1967 1987 1972 1990 1982 1975 1982 1985
Lowest Precipitation (in.) 0.00 0.13 0.00 0.15 0.94 0.78 1.15 1.48 0.88 0.68 0.33 0.13 21.57
Year Lowest Occurred 1990 1969 1969 1988 1967 1961 1989 1961 1967 1976 1990 1969 1961
Heating Degree Days (F) 1652. 1417. 1240. 819. 515. 231. 76. 89. 276. 595. 987. 1426. 9323.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 18. 98. 70. 6. 0. 0. 0. 192.

Western Regional Climate Center, wrcc@dri.edu