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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) 21.5 28.0 40.0 55.6 69.4 78.6 82.6 80.2 71.1 58.5 40.1 26.8 54.4
Highest Mean Max. Temperature (F) 35.9 39.4 49.8 65.6 77.9 87.3 89.0 86.8 78.9 64.9 51.4 35.3 89.0
Year Highest Occurred 1990 1987 2000 1987 1977 1988 1988 1983 1998 1975 1999 1998 1988
Lowest Mean Max. Temperature (F) 8.7 17.0 32.1 45.9 62.4 72.9 74.5 76.0 63.5 53.2 30.6 12.7 8.7
Year Lowest Occurred 1977 1979 1975 1975 1997 1993 1992 1977 1993 1987 1991 1983 1977
Mean Temperature (F) 12.0 18.5 31.0 45.8 58.5 67.6 72.1 69.9 60.6 48.3 32.3 18.5 44.6
Highest Mean Temperature (F) 25.9 31.1 39.3 52.4 66.0 73.1 75.9 75.5 65.9 54.3 40.8 26.6 75.9
Year Highest Occurred 1990 1998 2000 1977 1977 1988 1974 1983 1998 1973 1999 1997 1974
Lowest Mean Temperature (F) -1.0 5.6 22.8 39.2 52.6 62.2 65.1 65.0 54.9 42.9 22.9 4.6 -1.0
Year Lowest Occurred 1977 1979 1975 1975 1997 1982 1992 1992 1993 1987 1991 1983 1977
Mean Min. Temperature (F) 2.5 8.9 21.9 36.0 47.6 56.6 61.5 59.5 50.1 38.0 24.4 10.2 34.8
Highest Mean Min. Temperature (F) 15.9 24.8 30.7 41.9 54.1 61.6 65.2 65.0 54.5 44.5 30.2 19.9 65.2
Year Highest Occurred 1990 1998 1973 1977 1977 1971 1983 1995 1994 1971 1999 1997 1983
Lowest Mean Min. Temperature (F) -10.8 -5.7 13.2 30.7 42.2 50.6 55.6 53.9 44.6 32.1 15.1 -3.6 -10.8
Year Lowest Occurred 1977 1979 1996 1996 1971 1982 1992 1992 1974 1988 1991 1983 1977
Mean Precipitation (in.) 0.81 0.64 1.71 2.73 3.49 4.03 4.25 3.97 3.48 2.17 1.81 0.86 29.95
Highest Precipitation (in.) 2.65 2.62 4.23 6.62 6.17 8.07 10.87 7.97 9.37 5.32 4.76 2.53 10.87
Year Highest Occurred 1975 1981 1998 1975 1973 1990 1987 1979 1992 1995 1975 1982 1987
Lowest Precipitation (in.) 0.10 0.00 0.23 0.37 0.70 0.63 1.10 0.95 0.67 0.31 0.00 0.00 0.00
Year Lowest Occurred 1981 1987 1994 1987 1992 1988 1980 1971 1987 1975 1976 1986 1987
Heating Degree Days (F) 1644. 1304. 1057. 579. 243. 51. 13. 27. 166. 522. 983. 1443. 8032.
Cooling Degree Days (F) 0. 0. 0. 2. 41. 130. 231. 178. 34. 1. 0. 0. 617.

Western Regional Climate Center, wrcc@dri.edu