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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) 20.8 26.5 35.1 47.0 58.9 68.5 76.2 73.9 65.9 53.8 38.0 25.1 49.1
Highest Mean Max. Temperature (F) 31.2 35.5 43.1 57.2 67.3 76.0 83.9 82.1 71.5 58.0 45.7 34.0 83.9
Year Highest Occurred 1990 1998 2000 1987 1992 1988 1988 1983 1998 1971 1999 1979 1988
Lowest Mean Max. Temperature (F) 10.1 13.6 27.9 40.1 52.5 64.8 70.7 70.0 60.8 49.8 29.9 12.8 10.1
Year Lowest Occurred 1994 1979 1972 1975 1974 1993 1996 1979 1977 1988 1995 1983 1994
Mean Temperature (F) 12.1 18.1 28.0 39.4 50.0 58.9 66.6 65.6 57.3 45.7 31.4 17.5 40.9
Highest Mean Temperature (F) 22.7 30.8 35.1 46.6 54.6 64.8 72.6 72.2 62.8 50.4 39.2 27.6 72.6
Year Highest Occurred 1990 1998 2000 1987 1998 1988 1975 1983 1998 1971 1981 1997 1975
Lowest Mean Temperature (F) 1.0 5.8 20.8 34.5 45.6 55.6 61.5 60.7 51.4 40.6 23.2 3.9 1.0
Year Lowest Occurred 1994 1979 1972 1995 1997 1983 1992 1977 1993 1976 1995 1983 1994
Mean Min. Temperature (F) 3.4 9.7 20.8 31.8 41.0 49.2 57.0 57.3 48.7 37.6 24.8 9.9 32.6
Highest Mean Min. Temperature (F) 14.7 26.0 30.2 36.1 45.6 53.7 61.8 62.3 54.0 43.1 32.6 21.5 62.3
Year Highest Occurred 1998 1998 1973 1987 1998 1988 1975 1983 1998 1998 1981 1997 1983
Lowest Mean Min. Temperature (F) -8.1 -3.5 12.8 27.0 37.4 45.1 51.9 50.8 41.8 31.2 16.5 -5.1 -8.1
Year Lowest Occurred 1994 1989 1996 1996 1983 1983 1992 1977 1993 1976 1995 1983 1994
Mean Precipitation (in.) 1.01 0.78 1.88 2.14 3.09 3.98 4.24 4.11 4.21 2.38 2.04 0.92 30.78
Highest Precipitation (in.) 3.03 2.20 8.38 5.03 6.74 7.92 8.98 8.63 8.46 6.38 5.67 2.82 8.98
Year Highest Occurred 1975 1981 1977 1981 1991 1986 1991 1972 1991 1982 1991 1982 1991
Lowest Precipitation (in.) 0.11 0.09 0.37 0.25 0.29 0.98 0.72 1.07 0.85 0.32 0.16 0.03 0.03
Year Lowest Occurred 1981 1988 1984 1987 1976 1987 1988 1982 1974 1993 1976 1999 1999
Heating Degree Days (F) 1641. 1314. 1149. 768. 468. 202. 65. 74. 245. 598. 1009. 1473. 9006.
Cooling Degree Days (F) 0. 0. 0. 0. 1. 17. 116. 93. 14. 0. 0. 0. 241.

Western Regional Climate Center, wrcc@dri.edu