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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) 24.3 29.9 40.7 55.1 68.4 77.2 81.3 78.6 70.0 58.0 41.8 28.5 54.5
Highest Mean Max. Temperature (F) 37.1 37.6 50.1 61.7 79.1 83.1 85.8 83.5 77.3 65.6 53.4 38.0 85.8
Year Highest Occurred 1990 1998 2000 1977 1977 1988 1983 1983 1998 1973 1999 1998 1983
Lowest Mean Max. Temperature (F) 14.4 21.7 33.4 47.6 60.6 72.1 75.1 73.9 64.2 52.3 34.1 18.5 14.4
Year Lowest Occurred 1977 1979 1984 1975 1997 1982 1992 1997 1993 1980 1995 1983 1977
Mean Temperature (F) 15.2 20.3 31.3 44.3 56.6 65.6 70.3 67.9 59.3 47.9 34.0 20.7 44.5
Highest Mean Temperature (F) 27.4 31.4 39.9 49.5 64.0 70.4 74.4 72.5 65.6 55.1 42.2 28.8 74.4
Year Highest Occurred 1990 1998 2000 1977 1977 1995 1999 1995 1998 1971 1999 1997 1999
Lowest Mean Temperature (F) 3.7 10.2 24.4 37.6 50.5 59.6 65.3 64.7 54.1 42.8 26.6 8.9 3.7
Year Lowest Occurred 1977 1979 1972 1975 1983 1982 1992 1986 1975 1987 1995 2000 1977
Mean Min. Temperature (F) 6.0 10.7 21.8 33.5 44.8 54.0 59.2 57.2 48.6 37.8 26.1 12.8 34.4
Highest Mean Min. Temperature (F) 17.7 25.2 29.6 38.7 52.1 58.6 64.2 63.7 55.0 46.3 32.7 23.1 64.2
Year Highest Occurred 1990 1998 2000 1999 1998 1995 1999 1995 1994 1971 1998 1997 1999
Lowest Mean Min. Temperature (F) -6.9 -1.3 14.1 27.5 38.4 47.0 54.7 53.2 42.6 32.3 17.5 -0.9 -6.9
Year Lowest Occurred 1977 1979 1975 1975 1971 1982 1971 1976 1974 1976 1976 2000 1977
Mean Precipitation (in.) 1.36 1.05 2.24 3.05 3.74 3.91 4.37 4.11 3.62 2.40 2.39 1.37 33.61
Highest Precipitation (in.) 3.49 3.28 5.06 5.87 9.18 9.31 12.18 10.59 9.86 5.24 5.15 3.07 12.18
Year Highest Occurred 1998 1981 1973 1994 1973 1996 1994 1995 1986 1995 1991 1982 1994
Lowest Precipitation (in.) 0.11 0.17 0.17 0.65 0.99 0.72 1.02 1.64 0.41 0.26 0.00 0.23 0.00
Year Lowest Occurred 1981 1982 1978 1997 1981 1988 1998 1989 1976 1975 1976 1989 1976
Heating Degree Days (F) 1546. 1252. 1046. 622. 294. 73. 15. 38. 196. 532. 931. 1374. 7919.
Cooling Degree Days (F) 0. 0. 0. 1. 34. 91. 177. 127. 26. 1. 0. 0. 457.

Western Regional Climate Center, wrcc@dri.edu