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NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 37.7 37.7 42.8 50.4 59.1 68.0 74.6 74.2 68.7 59.7 50.9 42.6 55.5
Highest Mean Max. Temperature (F) 42.6 42.7 46.6 54.7 63.5 70.9 80.0 76.5 72.4 64.7 55.0 47.5 80.0
Year Highest Occurred 1998 1976 2000 1976 1991 1999 1999 1984 1983 1971 1994 1996 1999
Lowest Mean Max. Temperature (F) 30.0 28.8 38.7 46.4 56.0 63.0 71.5 71.3 66.0 56.4 46.4 31.5 28.8
Year Lowest Occurred 1981 1979 1984 1972 1971 1972 1992 1986 1986 1981 1976 1989 1979
Mean Temperature (F) 30.9 31.0 36.8 44.8 53.5 62.0 68.3 68.0 62.8 53.5 45.0 36.2 49.4
Highest Mean Temperature (F) 37.4 36.7 40.6 47.8 57.1 65.1 73.2 70.3 66.1 58.6 49.3 41.0 73.2
Year Highest Occurred 1995 1998 2000 1976 1991 1999 1999 1988 1971 1971 1994 1996 1999
Lowest Mean Temperature (F) 22.4 22.5 32.6 40.3 51.2 58.6 65.5 65.7 59.8 50.1 39.9 24.6 22.4
Year Lowest Occurred 1981 1979 1984 1972 1995 1982 1992 1986 1978 1972 1976 1989 1981
Mean Min. Temperature (F) 24.0 24.3 30.7 39.1 47.9 56.0 61.9 61.8 56.9 47.2 39.1 29.7 43.2
Highest Mean Min. Temperature (F) 32.4 31.3 34.5 41.8 50.7 59.2 66.3 64.4 60.7 52.4 43.5 34.8 66.3
Year Highest Occurred 1995 1998 2000 2000 1991 1999 1999 1988 1971 1971 1994 1982 1999
Lowest Mean Min. Temperature (F) 14.8 16.1 26.5 34.2 45.6 53.8 59.4 59.3 53.1 43.3 33.3 17.7 14.8
Year Lowest Occurred 1981 1979 1984 1972 1995 1982 1992 1987 1978 1974 1976 1989 1981
Mean Precipitation (in.) 4.23 3.98 4.14 3.95 3.71 3.44 3.38 3.33 3.91 4.12 3.89 4.63 46.71
Highest Precipitation (in.) 11.27 8.35 9.84 7.64 7.09 9.09 9.93 7.80 11.91 7.12 8.13 8.55 11.91
Year Highest Occurred 1998 1998 1983 1983 1990 1972 1986 1985 1996 1976 1988 1977 1996
Lowest Precipitation (in.) 1.61 1.21 1.36 1.40 1.53 0.30 0.87 0.26 0.80 1.29 1.06 0.94 0.26
Year Lowest Occurred 1985 1980 1981 1999 1991 1999 1974 1993 1983 1992 1984 1998 1993
Heating Degree Days (F) 1058. 952. 875. 608. 357. 110. 16. 12. 89. 359. 601. 894. 5931.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 20. 116. 104. 24. 1. 0. 0. 265.

Western Regional Climate Center, wrcc@dri.edu