Half Day, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 14° 30° -27° (1982) 63° (1997) 1.89" NA
February 18° 35° -20° (1996) 74° (2000) 1.56" NA
March 28° 45° -5° (2002) 83° (1986) 2.5" NA
April 37° 56° 10° (1982) 90° (2002) 3.7" NA
May 47° 67° 28° (2004) 93° (1991) 3.59" NA
June 56° 78° 37° (1993) 102° (1988) 3.86" NA
July 63° 83° 45° (1982) 105° (1995) 3.5" NA
August 62° 81° 42° (1986) 101° (1991) 4.84" NA
September 54° 75° 30° (1995) 97° (1990) 3.24" NA
October 42° 63° 24° (1992) 89° (2007) 2.7" NA
November 32° 49° 6° (1986) 76° (1999) 3.22" NA
December 20° 36° -20° (1983) 70° (2001) 2.2" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 26° 41° 12° (2002) 61° (1998) 0.09" NA
Dec 2 25° 41° 13° (1985) 64° (1982) 0.09" NA
Dec 3 25° 40° 5° (1985) 66° (1982) 0.09" NA
Dec 4 25° 40° 5° (1991) 69° (1998) 0.09" NA
Dec 5 24° 40° 7° (1991) 65° (1998) 0.08" NA
Dec 6 24° 39° 0° (2007) 70° (2001) 0.08" NA
Dec 7 23° 39° 8° (1984) 58° (1998) 0.08" NA
Dec 8 23° 38° 5° (2006) 53° (1991) 0.08" NA
Dec 9 23° 38° -5° (1995) 60° (1991) 0.08" NA
Dec 10 22° 38° -5° (1995) 56° (1990) 0.08" NA
Dec 11 22° 37° 0° (1995) 57° (2003) 0.07" NA
Dec 12 21° 37° 2° (1995) 55° (1990) 0.07" NA
Dec 13 21° 36° -2° (2000) 58° (1991) 0.07" NA
Dec 14 21° 36° -6° (1985) 47° (1998) 0.07" NA
Dec 15 20° 36° -9° (1989) 51° (1998) 0.07" NA
Dec 16 20° 35° -7° (1989) 59° (1984) 0.07" NA
Dec 17 20° 35° -2° (1989) 61° (1984) 0.07" NA
Dec 18 19° 35° -7° (1985) 52° (2002) 0.07" NA
Dec 19 19° 34° -14° (1983) 55° (2002) 0.07" NA
Dec 20 19° 34° -12° (1983) 55° (1988) 0.07" NA
Dec 21 18° 34° -15° (1989) 56° (1988) 0.06" NA
Dec 22 18° 34° -14° (1989) 54° (1994) 0.06" NA
Dec 23 18° 33° -13° (1983) 56° (2006) 0.06" NA
Dec 24 17° 33° -20° (1983) 60° (1982) 0.06" NA
Dec 25 17° 33° -18° (1983) 61° (1982) 0.06" NA
Dec 26 17° 32° -10° (1983) 63° (1982) 0.06" NA
Dec 27 16° 32° -5° (1990) 50° (1994) 0.06" NA
Dec 28 16° 32° 2° (1985) 62° (1982) 0.06" NA
Dec 29 16° 32° -4° (1983) 65° (1984) 0.06" NA
Dec 30 16° 32° -6° (1983) 50° (2002) 0.06" NA
Dec 31 15° 31° -2° (1983) 60° (2002) 0.06" NA
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