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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) 25.4 30.0 41.6 55.5 68.6 77.8 81.8 79.4 71.6 59.9 43.9 30.6 55.5
Highest Mean Max. Temperature (F) 36.8 40.3 51.2 64.0 78.8 84.3 86.6 85.0 80.0 68.4 54.1 38.7 86.6
Year Highest Occurred 1990 1998 2000 1977 1977 1988 1988 1988 1998 1971 1999 1998 1988
Lowest Mean Max. Temperature (F) 14.1 20.5 33.9 47.2 61.4 72.3 75.8 75.4 64.9 53.5 35.9 19.1 14.1
Year Lowest Occurred 1977 1979 1984 1975 1997 1982 1992 1997 1993 1988 1995 1983 1977
Mean Temperature (F) 16.0 20.6 32.3 45.3 57.8 67.2 71.6 69.1 60.6 49.2 35.4 22.3 45.6
Highest Mean Temperature (F) 26.2 33.0 40.7 51.8 65.9 71.4 76.0 75.0 65.2 57.3 42.6 30.9 76.0
Year Highest Occurred 1989 1998 2000 1977 1977 1995 1983 1995 1998 1971 1999 1982 1983
Lowest Mean Temperature (F) 3.1 9.8 25.4 39.0 50.6 61.9 66.0 64.8 54.9 43.0 26.6 10.9 3.1
Year Lowest Occurred 1977 1979 1975 1975 1997 1982 1996 1992 1993 1988 1996 1989 1977
Mean Min. Temperature (F) 6.6 11.2 23.0 35.1 46.9 56.6 61.4 58.8 49.6 38.5 26.8 13.9 35.7
Highest Mean Min. Temperature (F) 18.6 25.7 31.3 40.9 55.6 60.9 66.3 66.8 54.5 46.3 33.2 23.5 66.8
Year Highest Occurred 1992 1998 1973 1985 1991 1971 1983 1995 1994 1971 1975 1982 1995
Lowest Mean Min. Temperature (F) -8.0 -0.9 14.4 30.2 39.7 51.5 54.1 54.1 44.9 32.5 16.5 0.1 -8.0
Year Lowest Occurred 1977 1979 1996 1996 1997 1982 1996 1992 1993 1988 1976 1985 1977
Mean Precipitation (in.) 1.15 1.10 2.07 3.33 3.13 3.91 4.33 4.05 3.76 2.64 2.11 1.47 33.05
Highest Precipitation (in.) 2.72 2.74 5.25 7.24 6.06 7.60 10.97 10.16 14.72 5.86 5.75 4.02 14.72
Year Highest Occurred 1974 1971 1976 1999 1973 1996 1999 1995 1986 1995 1982 1971 1986
Lowest Precipitation (in.) 0.14 0.02 0.15 1.36 0.58 0.96 1.30 1.09 0.20 0.78 0.20 0.19 0.02
Year Lowest Occurred 1981 1995 1978 1989 1992 1987 1998 1984 1979 1997 1976 1993 1995
Heating Degree Days (F) 1519. 1243. 1014. 592. 271. 49. 13. 35. 159. 492. 890. 1326. 7603.
Cooling Degree Days (F) 0. 0. 0. 2. 46. 115. 218. 162. 27. 2. 0. 0. 572.

Western Regional Climate Center, wrcc@dri.edu