Fort Dearborn, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 18° 32° -24° (1985) 67° (1950) 2.17" NA
February 24° 38° -12° (1951) 71° (1976) 1.85" NA
March 32° 47° 0° (1962) 84° (1986) 3.01" NA
April 42° 59° 13° (1982) 91° (1986) 3.65" NA
May 51° 70° 32° (1954) 94° (1991) 3.7" NA
June 61° 80° 41° (1972) 104° (1988) 4.3" NA
July 66° 84° 51° (1975) 102° (1991) 3.68" NA
August 65° 83° 49° (1965) 101° (1988) 3.86" NA
September 57° 76° 37° (1974) 99° (1953) 3.21" NA
October 46° 64° 24° (1981) 92° (1971) 2.71" NA
November 35° 49° 0° (1950) 80° (1950) 3.32" NA
December 24° 37° -20° (1983) 69° (1982) 2.63" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 29° 42° 10° (1966) 67° (1970) 0.1" NA
Dec 2 28° 42° 5° (1976) 69° (1982) 0.1" NA
Dec 3 28° 41° 7° (1985) 69° (1982) 0.1" NA
Dec 4 28° 41° 3° (1991) 62° (1961) 0.1" NA
Dec 5 27° 41° 5° (1991) 64° (1975) 0.1" NA
Dec 6 27° 40° 3° (1977) 65° (1951) 0.09" NA
Dec 7 26° 40° 0° (1977) 60° (1980) 0.09" NA
Dec 8 26° 40° 3° (1958) 63° (1966) 0.09" NA
Dec 9 26° 39° -4° (1958) 61° (1991) 0.09" NA
Dec 10 25° 39° -5° (1978) 59° (1971) 0.09" NA
Dec 11 25° 38° -1° (1962) 62° (1949) 0.09" NA
Dec 12 25° 38° -4° (1962) 57° (1990) 0.09" NA
Dec 13 24° 38° 1° (1963) 61° (1991) 0.09" NA
Dec 14 24° 37° -3° (1985) 64° (1975) 0.08" NA
Dec 15 24° 37° -6° (1951) 64° (1975) 0.08" NA
Dec 16 23° 37° -10° (1951) 60° (1984) 0.08" NA
Dec 17 23° 37° 0° (1951) 62° (1984) 0.08" NA
Dec 18 23° 36° -5° (1985) 56° (1977) 0.08" NA
Dec 19 22° 36° -10° (1983) 55° (1957) 0.08" NA
Dec 20 22° 36° -5° (1963) 58° (1949) 0.08" NA
Dec 21 22° 35° -13° (1989) 60° (1967) 0.08" NA
Dec 22 21° 35° -12° (1989) 56° (1957) 0.08" NA
Dec 23 21° 35° -11° (1983) 58° (1982) 0.08" NA
Dec 24 21° 35° -20° (1983) 60° (1982) 0.08" NA
Dec 25 21° 34° -12° (1983) 63° (1982) 0.08" NA
Dec 26 20° 34° -6° (1983) 63° (1982) 0.08" NA
Dec 27 20° 34° -2° (1950) 58° (1959) 0.08" NA
Dec 28 20° 34° -2° (1961) 65° (1984) 0.08" NA
Dec 29 20° 33° -5° (1976) 66° (1984) 0.07" NA
Dec 30 19° 33° -5° (1983) 57° (1965) 0.07" NA
Dec 31 19° 33° -9° (1967) 58° (1965) 0.07" NA
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