date! ,

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 25.1 28.8 36.8 48.0 61.0 69.7 75.6 74.4 65.9 54.7 40.4 29.5 50.8
Highest Mean Max. Temperature (F) 33.0 37.8 45.6 55.5 70.1 75.4 81.9 79.1 71.3 61.7 48.1 36.3 81.9
Year Highest Occurred 1990 1998 2000 1987 1977 1988 1983 1983 1998 1973 1999 1994 1983
Lowest Mean Max. Temperature (F) 15.7 20.5 30.0 41.6 52.3 64.5 67.7 70.1 61.9 48.5 32.7 20.3 15.7
Year Lowest Occurred 1994 1979 1972 1996 1973 1982 1992 1977 1974 1988 1995 1989 1994
Mean Temperature (F) 18.1 21.2 29.6 40.4 51.5 60.2 66.4 65.8 57.7 47.1 34.4 23.3 43.0
Highest Mean Temperature (F) 26.7 32.7 38.0 46.8 58.6 64.7 71.5 70.3 64.0 53.3 41.6 30.4 71.5
Year Highest Occurred 1990 1998 2000 1987 1977 1999 1999 1983 1998 1971 1999 1997 1999
Lowest Mean Temperature (F) 7.9 11.4 22.6 34.5 45.6 55.2 60.2 61.2 52.5 42.3 27.2 14.3 7.9
Year Lowest Occurred 1994 1979 1972 1996 1973 1982 1992 1977 1974 1988 1995 1976 1994
Mean Min. Temperature (F) 11.0 13.6 22.3 32.7 42.0 50.7 57.1 57.1 49.4 39.5 28.4 17.0 35.1
Highest Mean Min. Temperature (F) 20.5 27.5 30.4 38.3 47.0 56.9 63.2 63.1 56.7 46.1 35.0 26.6 63.2
Year Highest Occurred 1990 1998 2000 1998 1977 1999 1999 1998 1998 1971 1999 1997 1999
Lowest Mean Min. Temperature (F) 0.1 2.3 15.2 27.3 35.4 46.0 52.6 52.2 43.0 34.9 21.6 5.8 0.1
Year Lowest Occurred 1994 1979 1972 1996 1996 1982 1996 1977 1974 1972 1995 1976 1994
Mean Precipitation (in.) 2.04 1.35 2.24 2.35 2.66 2.74 2.64 3.01 3.42 3.03 2.60 1.95 30.03
Highest Precipitation (in.) 5.40 2.82 4.09 4.82 7.16 5.59 5.20 11.76 8.25 5.85 7.30 3.44 11.76
Year Highest Occurred 1997 1984 1977 1996 1973 1979 1979 1988 1980 1983 1988 1981 1988
Lowest Precipitation (in.) 0.62 0.18 0.39 0.59 0.05 0.77 0.51 0.50 1.13 1.29 0.77 0.41 0.05
Year Lowest Occurred 1991 1993 1980 2000 1986 1988 1998 1976 2000 1999 1986 1994 1986
Heating Degree Days (F) 1456. 1227. 1099. 740. 427. 174. 70. 75. 234. 556. 919. 1295. 8272.
Cooling Degree Days (F) 0. 0. 0. 0. 8. 29. 111. 99. 13. 0. 0. 0. 260.

Western Regional Climate Center, wrcc@dri.edu