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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) 16.6 23.5 36.2 51.9 65.6 74.8 79.9 76.9 66.5 55.3 37.1 21.1 50.5
Highest Mean Max. Temperature (F) 29.6 36.5 46.2 62.7 75.6 82.1 85.4 83.4 72.2 68.2 45.5 28.4 55.6
Year Highest Occurred 1990 1987 1968 1987 1977 1988 1988 1969 1978 1963 1963 1979 1987
Lowest Mean Max. Temperature (F) 6.1 13.1 26.8 42.7 58.2 68.6 75.1 70.9 56.0 49.2 26.6 7.1 46.7
Year Lowest Occurred 1977 1989 1965 1975 1979 1982 1978 1985 1965 1987 1985 1983 1985
Mean Temperature (F) 4.7 10.9 24.9 40.6 53.3 62.6 68.0 65.2 55.3 44.5 28.3 11.1 39.1
Highest Mean Temperature (F) 20.3 25.8 34.7 48.2 61.6 67.2 72.2 70.7 59.4 55.1 34.4 19.8 44.7
Year Highest Occurred 1990 1987 1973 1987 1977 1988 1988 1983 1990 1963 1963 1965 1987
Lowest Mean Temperature (F) -6.9 -0.3 13.7 33.3 47.2 56.6 64.0 60.8 48.1 37.8 18.5 -3.9 36.5
Year Lowest Occurred 1977 1989 1965 1975 1967 1969 1971 1977 1965 1976 1985 1983 1985
Mean Min. Temperature (F) -7.3 -1.8 13.6 29.2 40.8 50.2 56.1 53.4 44.1 33.7 19.4 1.0 27.7
Highest Mean Min. Temperature (F) 10.9 15.0 25.7 34.7 47.5 53.7 61.4 59.9 49.4 41.9 25.1 12.2 33.7
Year Highest Occurred 1990 1987 1973 1977 1977 1987 1983 1983 1990 1963 1990 1987 1987
Lowest Mean Min. Temperature (F) -19.9 -13.7 0.5 23.9 34.3 44.0 52.4 48.7 37.5 24.3 8.9 -14.8 25.3
Year Lowest Occurred 1977 1989 1965 1975 1967 1969 1969 1977 1974 1976 1976 1983 1976
Mean Precipitation (in.) 0.72 0.55 1.45 2.22 3.16 4.41 4.60 3.75 3.17 2.38 1.42 1.04 28.87
Highest Precipitation (in.) 2.58 1.76 3.60 5.24 7.11 9.58 22.70 6.59 6.45 8.03 4.13 3.58 47.01
Year Highest Occurred 1969 1971 1965 1985 1962 1976 1972 1986 1968 1971 1983 1984 1972
Lowest Precipitation (in.) 0.02 0.02 0.25 0.16 1.20 0.22 0.41 0.64 0.47 0.10 0.00 0.04 16.47
Year Lowest Occurred 1961 1968 1969 1980 1967 1961 1989 1969 1967 1978 1990 1980 1987
Heating Degree Days (F) 1869. 1515. 1243. 732. 378. 117. 40. 76. 296. 636. 1101. 1671. 9674.
Cooling Degree Days (F) 0. 0. 0. 0. 16. 45. 133. 82. 5. 0. 0. 0. 281.

Western Regional Climate Center, wrcc@dri.edu