date! ,

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 17.7 25.3 36.1 52.1 66.2 73.3 77.6 75.5 66.0 54.0 35.2 21.7 50.1
Highest Mean Max. Temperature (F) 29.5 35.6 46.6 64.5 73.7 81.4 84.9 81.2 73.2 59.3 46.1 29.8 84.9
Year Highest Occurred 1990 1998 2000 1987 1977 1988 1988 1983 1998 2000 1999 1999 1988
Lowest Mean Max. Temperature (F) 7.2 15.1 29.3 41.8 58.5 68.3 70.9 69.8 59.8 48.7 27.1 9.8 7.2
Year Lowest Occurred 1994 1979 1996 1975 1979 1982 1992 1977 1993 1988 1995 1983 1994
Mean Temperature (F) 7.6 14.8 26.4 40.7 53.3 61.0 65.9 64.2 55.3 44.3 27.9 13.3 39.6
Highest Mean Temperature (F) 19.9 28.5 35.5 47.9 59.9 65.5 69.8 69.4 60.4 49.3 37.0 22.7 69.8
Year Highest Occurred 1990 1998 2000 1987 1977 1995 1988 1983 1998 1973 1999 1997 1988
Lowest Mean Temperature (F) -4.4 3.3 18.7 33.5 47.2 55.7 59.8 58.9 49.8 37.3 20.3 -0.1 -4.4
Year Lowest Occurred 1982 1989 1996 1975 1979 1982 1992 1977 1993 1976 1995 1983 1982
Mean Min. Temperature (F) -2.5 4.2 16.7 29.2 40.4 48.6 54.1 52.9 44.6 34.6 20.5 4.9 29.0
Highest Mean Min. Temperature (F) 10.3 21.3 26.7 33.8 46.1 53.0 58.6 57.6 48.5 40.3 27.9 16.1 58.6
Year Highest Occurred 1990 1998 1973 1977 1977 1995 1983 1983 1978 1971 1999 1997 1983
Lowest Mean Min. Temperature (F) -16.0 -9.0 7.6 24.8 35.3 43.1 48.6 48.0 38.7 24.9 10.8 -10.1 -16.0
Year Lowest Occurred 1982 1989 1975 1996 1983 1985 1992 1977 1974 1976 1976 1983 1982
Mean Precipitation (in.) 0.95 0.67 1.41 2.08 3.27 4.36 4.23 4.12 3.36 2.50 1.68 0.83 29.46
Highest Precipitation (in.) 2.71 1.99 3.42 4.73 8.59 7.75 8.02 8.82 8.94 5.99 3.99 1.61 8.94
Year Highest Occurred 1975 1971 1979 1981 1991 1994 1972 1999 1986 1971 1996 1984 1986
Lowest Precipitation (in.) 0.17 0.11 0.45 0.26 0.89 0.92 1.32 0.96 0.51 0.48 0.24 0.15 0.11
Year Lowest Occurred 1981 1987 1996 1988 1976 1995 1989 1976 1976 1993 1976 1979 1987
Heating Degree Days (F) 1781. 1407. 1196. 731. 374. 154. 67. 102. 297. 641. 1115. 1603. 9468.
Cooling Degree Days (F) 0. 0. 0. 0. 11. 32. 92. 76. 6. 0. 0. 0. 217.

Western Regional Climate Center, wrcc@dri.edu