date! ,

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 19.7 26.8 37.8 52.8 66.9 74.5 78.6 76.2 67.0 55.3 38.0 24.3 51.5
Highest Mean Max. Temperature (F) 31.7 39.4 45.4 61.7 77.1 81.2 84.4 80.8 76.4 61.9 47.6 31.7 84.4
Year Highest Occurred 1990 1998 2000 1987 1977 1988 1988 1998 1998 1973 1999 1997 1988
Lowest Mean Max. Temperature (F) 9.4 17.9 28.7 45.3 58.8 69.8 71.9 71.3 60.8 49.3 28.2 13.1 9.4
Year Lowest Occurred 1977 1989 1996 1995 1997 1982 1992 1977 1974 1987 1995 1983 1977
Mean Temperature (F) 8.4 14.7 26.0 39.8 52.2 61.0 65.7 63.3 54.4 43.0 29.0 14.4 39.3
Highest Mean Temperature (F) 20.2 30.7 35.2 45.8 59.9 65.9 69.7 68.1 60.8 49.7 36.4 24.1 69.7
Year Highest Occurred 1990 1998 1973 1998 1977 1991 1999 1995 1998 1971 1999 1997 1999
Lowest Mean Temperature (F) -3.5 3.2 17.3 33.6 46.5 55.3 60.1 58.2 48.1 37.2 20.3 2.7 -3.5
Year Lowest Occurred 1977 1989 1996 1975 1997 1982 1992 1977 1974 1976 1995 1983 1977
Mean Min. Temperature (F) -2.9 2.5 14.1 26.8 37.5 47.5 52.8 50.3 41.8 30.7 20.0 4.5 27.1
Highest Mean Min. Temperature (F) 10.0 21.9 25.3 32.5 44.8 53.6 56.6 57.3 46.4 37.9 26.2 16.5 57.3
Year Highest Occurred 1998 1998 1973 1999 1991 1991 1983 1995 1994 1971 1998 1997 1995
Lowest Mean Min. Temperature (F) -16.3 -11.6 4.9 20.9 31.5 40.8 47.9 45.1 35.2 23.0 9.4 -9.9 -16.3
Year Lowest Occurred 1977 1989 1975 1975 1971 1982 1971 1977 1976 1976 1976 1976 1977
Mean Precipitation (in.) 1.13 0.78 1.79 2.27 3.10 4.13 5.09 4.43 4.49 2.91 2.06 1.06 33.24
Highest Precipitation (in.) 3.57 2.62 3.83 4.13 6.33 7.48 9.75 8.30 10.95 6.55 7.37 2.70 10.95
Year Highest Occurred 1996 1998 1991 1985 1999 1993 1982 1980 1994 1995 1991 1996 1994
Lowest Precipitation (in.) 0.05 0.08 0.34 0.52 0.62 1.68 1.80 1.24 1.45 0.46 0.22 0.18 0.05
Year Lowest Occurred 1981 1997 1978 1988 1994 1997 1998 1976 1998 1976 1981 1999 1981
Heating Degree Days (F) 1757. 1410. 1209. 756. 412. 158. 61. 114. 324. 681. 1081. 1570. 9533.
Cooling Degree Days (F) 0. 0. 0. 0. 15. 38. 82. 60. 6. 0. 0. 0. 201.

Western Regional Climate Center, wrcc@dri.edu