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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) 25.4 28.5 37.8 48.6 59.1 68.9 74.9 73.8 66.7 55.1 42.4 30.2 51.0
Highest Mean Max. Temperature (F) 35.5 35.5 43.3 53.9 65.0 76.4 80.6 78.6 70.2 63.9 47.4 36.9 53.0
Year Highest Occurred 1990 1961 1968 1963 1977 1988 1976 1983 1961 1963 1963 1982 1987
Lowest Mean Max. Temperature (F) 15.4 20.5 32.2 44.2 53.7 62.5 69.1 69.8 62.2 49.8 37.5 20.1 48.6
Year Lowest Occurred 1977 1979 1965 1979 1983 1969 1978 1977 1984 1988 1976 1983 1978
Mean Temperature (F) 17.6 20.9 30.6 41.0 50.4 59.5 66.1 65.5 58.5 47.7 35.9 23.3 43.1
Highest Mean Temperature (F) 28.6 29.2 36.9 44.3 54.8 65.8 69.6 70.4 62.3 55.8 40.5 31.1 46.4
Year Highest Occurred 1990 1987 1973 1986 1977 1987 1976 1983 1990 1963 1963 1965 1987
Lowest Mean Temperature (F) 6.5 12.6 25.6 36.9 46.7 54.5 61.4 61.5 53.8 43.1 28.9 13.0 40.9
Year Lowest Occurred 1977 1979 1965 1975 1983 1969 1978 1977 1984 1988 1976 1983 1972
Mean Min. Temperature (F) 9.8 13.2 23.4 33.3 41.6 50.1 57.3 57.1 50.3 40.3 29.4 16.2 35.2
Highest Mean Min. Temperature (F) 21.6 23.0 30.5 37.2 45.2 56.2 61.5 62.2 55.4 47.7 33.6 25.6 39.8
Year Highest Occurred 1990 1987 1973 1987 1986 1987 1989 1983 1990 1963 1963 1965 1987
Lowest Mean Min. Temperature (F) -2.4 4.6 18.1 29.2 37.8 46.5 53.1 52.4 45.3 36.3 20.2 4.2 32.7
Year Lowest Occurred 1977 1979 1975 1975 1967 1969 1972 1967 1984 1988 1976 1976 1972
Mean Precipitation (in.) 1.45 1.27 2.37 2.70 2.77 2.95 2.65 3.21 3.57 2.30 2.23 1.89 29.36
Highest Precipitation (in.) 3.21 2.97 5.97 4.10 6.68 6.38 5.82 10.74 11.29 4.24 7.01 4.52 36.79
Year Highest Occurred 1979 1966 1976 1973 1973 1968 1986 1975 1986 1984 1985 1971 1990
Lowest Precipitation (in.) 0.10 0.01 0.36 0.83 0.35 0.35 0.98 0.23 0.15 0.24 0.33 0.40 20.65
Year Lowest Occurred 1981 1969 1978 1989 1988 1964 1968 1969 1979 1975 1976 1976 1989
Heating Degree Days (F) 1469. 1235. 1066. 720. 453. 181. 52. 63. 201. 536. 873. 1293. 8142.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 16. 86. 79. 6. 0. 0. 0. 187.

Western Regional Climate Center, wrcc@dri.edu