CHARLESTON, ILLINOIS

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 34.6 39.9 52.2 65.0 74.8 83.4 86.5 84.3 78.7 66.9 52.7 39.2 63.2
Highest Mean Max. Temperature (F) 47.5 51.2 59.0 70.5 83.1 88.5 92.8 90.4 83.3 79.4 58.4 48.9 65.7
Year Highest Occurred 1990 1976 1976 1977 1962 1988 1966 1983 1978 1963 1990 1984 1964
Lowest Mean Max. Temperature (F) 21.2 28.8 42.3 57.8 68.3 76.9 81.2 79.7 71.2 60.4 45.1 26.5 61.3
Year Lowest Occurred 1977 1978 1984 1983 1981 1982 1971 1985 1974 1976 1972 1983 1978
Mean Temperature (F) 26.4 31.1 42.7 54.3 64.1 72.8 76.3 74.1 68.0 56.4 44.1 31.6 53.5
Highest Mean Temperature (F) 38.8 40.5 50.6 59.1 71.7 76.7 81.0 79.5 71.5 66.1 48.7 40.4 55.6
Year Highest Occurred 1990 1976 1973 1977 1962 1971 1966 1983 1970 1963 1990 1982 1987
Lowest Mean Temperature (F) 12.7 19.2 34.1 48.8 58.9 67.1 72.9 70.4 60.9 50.1 35.7 19.4 51.4
Year Lowest Occurred 1977 1978 1965 1982 1981 1982 1971 1967 1974 1976 1976 1989 1979
Mean Min. Temperature (F) 18.1 22.2 33.1 43.6 53.4 62.2 66.1 64.0 57.2 45.8 35.5 24.0 43.8
Highest Mean Min. Temperature (F) 30.1 30.0 42.6 48.1 60.3 67.0 69.5 68.5 62.8 52.8 38.9 33.3 47.2
Year Highest Occurred 1990 1990 1973 1985 1962 1971 1986 1983 1973 1971 1990 1982 1973
Lowest Mean Min. Temperature (F) 4.2 9.5 25.8 37.8 48.0 57.2 63.0 59.9 50.6 39.2 24.9 10.6 40.9
Year Lowest Occurred 1977 1978 1965 1982 1961 1982 1975 1976 1974 1988 1976 1989 1976
Mean Precipitation (in.) 2.03 2.11 3.40 3.72 4.14 3.60 4.57 3.28 3.31 3.01 3.48 3.43 40.08
Highest Precipitation (in.) 5.49 5.46 7.43 7.71 10.45 9.37 10.10 10.41 8.60 8.39 11.57 8.33 52.39
Year Highest Occurred 1975 1990 1973 1989 1974 1973 1987 1981 1989 1983 1985 1990 1974
Lowest Precipitation (in.) 0.00 0.13 1.05 0.22 0.83 0.71 1.29 0.52 0.12 0.30 0.60 0.37 27.33
Year Lowest Occurred 1986 1963 1966 1971 1964 1988 1974 1984 1979 1964 1976 1976 1976
Heating Degree Days (F) 1197. 949. 691. 328. 140. 5. 0. 0. 41. 292. 627. 1035. 5305.
Cooling Degree Days (F) 0. 0. 0. 7. 112. 239. 350. 286. 131. 26. 0. 0. 1151.

Western Regional Climate Center, wrcc@dri.edu