CHICAGO MIDWAY AP 3 SW, ILLINOIS

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 29.9 34.5 46.3 59.1 70.8 80.8 84.4 82.5 75.4 63.7 48.9 35.0 59.3
Highest Mean Max. Temperature (F) 42.5 45.1 53.4 65.9 81.2 87.1 89.6 88.2 80.7 75.8 56.0 43.9 62.1
Year Highest Occurred 1990 1976 1968 1977 1977 1971 1988 1983 1978 1963 1975 1982 1990
Lowest Mean Max. Temperature (F) 18.3 23.8 35.6 51.2 64.2 75.4 79.6 77.9 69.9 57.3 41.5 22.8 56.3
Year Lowest Occurred 1977 1979 1965 1975 1967 1969 1967 1967 1975 1988 1972 1983 1979
Mean Temperature (F) 22.4 26.9 38.2 49.7 60.5 70.5 75.1 73.4 66.0 54.2 41.4 28.1 50.5
Highest Mean Temperature (F) 34.9 35.8 45.1 54.6 69.3 75.8 79.1 78.8 70.4 64.3 47.5 37.1 53.6
Year Highest Occurred 1990 1976 1973 1977 1977 1971 1988 1988 1971 1963 1990 1982 1990
Lowest Mean Temperature (F) 10.1 16.7 30.2 43.5 54.8 64.4 70.6 69.2 61.4 48.2 32.8 16.5 48.1
Year Lowest Occurred 1977 1979 1965 1975 1967 1982 1967 1967 1975 1987 1976 1983 1979
Mean Min. Temperature (F) 14.9 19.3 30.0 40.2 50.2 60.2 65.7 64.2 56.5 44.7 33.8 21.2 41.7
Highest Mean Min. Temperature (F) 27.2 28.0 37.6 45.0 57.3 64.5 69.0 69.7 61.3 52.8 39.4 30.3 45.2
Year Highest Occurred 1990 1984 1973 1985 1977 1987 1977 1988 1971 1963 1990 1982 1990
Lowest Mean Min. Temperature (F) 1.9 8.9 24.4 34.5 44.0 52.9 61.5 60.3 50.9 38.4 23.9 9.9 39.4
Year Lowest Occurred 1977 1978 1984 1982 1981 1982 1967 1982 1974 1980 1976 1963 1978
Mean Precipitation (in.) 1.70 1.52 2.86 3.93 3.55 3.89 4.18 3.74 3.68 2.51 2.99 2.83 37.38
Highest Precipitation (in.) 4.09 3.13 5.37 7.84 6.99 8.75 7.58 9.95 14.17 5.54 7.63 7.21 49.44
Year Highest Occurred 1965 1990 1976 1975 1980 1967 1969 1987 1961 1985 1985 1982 1990
Lowest Precipitation (in.) 0.13 0.25 0.61 0.45 1.39 1.09 1.40 0.80 0.01 0.20 0.55 0.30 22.22
Year Lowest Occurred 1981 1969 1981 1971 1977 1988 1977 1976 1979 1964 1976 1962 1962
Heating Degree Days (F) 1321. 1067. 831. 459. 209. 24. 0. 6. 55. 352. 708. 1144. 6176.
Cooling Degree Days (F) 0. 0. 0. 0. 70. 189. 313. 266. 85. 17. 0. 0. 940.

Western Regional Climate Center, wrcc@dri.edu