Custer Park, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 13° 30° -26° (1985) 65° (1997) 1.58" NA
February 19° 35° -20° (1979) 73° (2000) 1.64" NA
March 28° 47° -7° (2002) 86° (1986) 2.46" NA
April 37° 60° 11° (1982) 92° (1986) 3.75" NA
May 48° 72° 30° (2005) 93° (2006) 3.87" NA
June 58° 81° 35° (1985) 104° (1988) 4.22" NA
July 63° 85° 47° (1983) 103° (1995) 4.34" NA
August 61° 82° 39° (1986) 102° (1988) 3.82" NA
September 53° 76° 32° (1983) 97° (1978) 3.14" NA
October 41° 64° 17° (1976) 88° (2007) 2.7" NA
November 31° 48° -2° (1977) 78° (1978) 3" NA
December 20° 35° -20° (1983) 70° (1982) 2.44" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 25° 41° 7° (1976) 61° (1998) 0.1" NA
Dec 2 25° 40° 4° (1976) 65° (1982) 0.09" NA
Dec 3 24° 40° 2° (1976) 70° (1982) 0.09" NA
Dec 4 24° 39° 0° (1991) 67° (1998) 0.09" NA
Dec 5 23° 39° -4° (1991) 67° (1998) 0.09" NA
Dec 6 23° 39° -4° (1977) 68° (2001) 0.09" NA
Dec 7 23° 38° -6° (1977) 62° (1980) 0.09" NA
Dec 8 22° 38° -6° (1977) 57° (1980) 0.09" NA
Dec 9 22° 37° -7° (1977) 60° (1991) 0.09" NA
Dec 10 21° 37° -11° (1977) 54° (1993) 0.09" NA
Dec 11 21° 37° -11° (1977) 56° (1979) 0.08" NA
Dec 12 21° 36° -3° (1977) 57° (1979) 0.08" NA
Dec 13 20° 36° -3° (2000) 61° (1991) 0.08" NA
Dec 14 20° 35° -6° (1985) 64° (1975) 0.08" NA
Dec 15 20° 35° -8° (1989) 65° (1975) 0.08" NA
Dec 16 19° 35° -11° (1989) 57° (1984) 0.08" NA
Dec 17 19° 35° -11° (1989) 62° (1984) 0.08" NA
Dec 18 19° 34° -10° (1985) 55° (1977) 0.08" NA
Dec 19 18° 34° -12° (1983) 53° (1998) 0.08" NA
Dec 20 18° 34° -13° (1983) 55° (1988) 0.07" NA
Dec 21 18° 33° -13° (1989) 58° (1988) 0.07" NA
Dec 22 17° 33° -19° (1989) 54° (1984) 0.07" NA
Dec 23 17° 33° -17° (1989) 53° (1982) 0.07" NA
Dec 24 17° 32° -20° (1983) 61° (1982) 0.07" NA
Dec 25 16° 32° -20° (1983) 62° (1982) 0.07" NA
Dec 26 16° 32° -13° (1983) 62° (1982) 0.07" NA
Dec 27 16° 32° -5° (1977) 46° (1994) 0.07" NA
Dec 28 16° 32° -5° (1977) 63° (1982) 0.07" NA
Dec 29 15° 31° -8° (1983) 66° (1984) 0.06" NA
Dec 30 15° 31° -11° (1983) 60° (1984) 0.06" NA
Dec 31 15° 31° -14° (1976) 61° (2002) 0.06" NA
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