date! ,

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 18.7 25.0 36.3 52.1 66.1 74.2 78.3 76.1 67.1 54.8 38.2 24.0 50.9
Highest Mean Max. Temperature (F) 31.0 36.2 47.2 60.3 76.2 81.2 84.8 81.2 75.1 61.9 48.5 33.1 84.8
Year Highest Occurred 1990 1998 2000 1987 1977 1988 1988 1988 1998 1973 1999 1998 1988
Lowest Mean Max. Temperature (F) 6.8 17.0 29.5 43.5 57.7 68.8 72.2 71.8 60.7 48.7 29.8 10.9 6.8
Year Lowest Occurred 1977 1989 1972 1975 1973 1982 1992 1997 1993 1987 1995 1983 1977
Mean Temperature (F) 8.9 14.8 27.0 42.0 55.0 63.6 67.9 65.6 56.3 44.7 30.2 15.2 40.9
Highest Mean Temperature (F) 21.5 29.2 37.6 47.6 62.0 69.1 72.0 71.5 62.5 51.7 38.1 24.4 72.0
Year Highest Occurred 1990 1998 2000 1987 1977 1991 1983 1995 1998 1971 1999 1997 1983
Lowest Mean Temperature (F) -5.9 4.8 18.6 34.6 49.0 57.8 62.6 59.8 50.8 38.8 22.1 1.9 -5.9
Year Lowest Occurred 1977 1989 1975 1975 1997 1982 1992 1977 1993 1988 1976 1983 1977
Mean Min. Temperature (F) -1.0 4.6 17.6 31.9 43.8 53.0 57.4 55.0 45.4 34.5 22.1 6.4 30.9
Highest Mean Min. Temperature (F) 12.0 22.2 28.2 37.5 50.9 58.9 61.3 63.5 50.7 41.7 28.3 17.5 63.5
Year Highest Occurred 1990 1998 1973 1986 1991 1991 1999 1995 1994 1971 1998 1997 1995
Lowest Mean Min. Temperature (F) -18.6 -8.0 7.5 25.8 38.1 46.8 53.0 47.1 37.8 26.5 10.8 -8.8 -18.6
Year Lowest Occurred 1977 1978 1975 1975 1997 1982 1976 1977 1976 1976 1976 1976 1977
Mean Precipitation (in.) 1.05 0.87 1.85 2.52 3.55 4.42 4.18 4.49 4.21 2.52 2.15 1.20 33.01
Highest Precipitation (in.) 2.83 2.18 3.67 4.19 8.63 12.13 9.57 8.18 10.14 7.47 7.00 2.94 12.13
Year Highest Occurred 1996 1981 1976 1999 1973 1980 1999 1980 1986 1979 1991 1982 1980
Lowest Precipitation (in.) 0.04 0.06 0.10 0.62 0.74 1.17 0.89 1.52 0.81 0.30 0.12 0.07 0.04
Year Lowest Occurred 1981 1987 1978 1997 1986 1983 1974 1996 1979 1976 1976 1997 1981
Heating Degree Days (F) 1743. 1406. 1179. 691. 337. 109. 32. 78. 272. 632. 1045. 1543. 9067.
Cooling Degree Days (F) 0. 0. 0. 0. 27. 67. 121. 94. 10. 0. 0. 0. 319.

Western Regional Climate Center, wrcc@dri.edu