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
Sep 1 58° 80° 49° (1986) 92° (2000) 0.12" NA
Sep 2 57° 80° 49° (1987) 95° (1984) 0.11" NA
Sep 3 57° 79° 51° (1982) 93° (2000) 0.11" NA
Sep 4 57° 79° 47° (1982) 91° (1999) 0.11" NA
Sep 5 56° 79° 47° (1982) 93° (1999) 0.11" NA
Sep 6 56° 79° 45° (1988) 92° (1983) 0.11" NA
Sep 7 56° 79° 40° (1986) 95° (1990) 0.11" NA
Sep 8 56° 78° 38° (1986) 93° (1978) 0.11" NA
Sep 9 55° 78° 37° (1986) 97° (1978) 0.11" NA
Sep 10 55° 78° 40° (1986) 95° (1978) 0.11" NA
Sep 11 55° 78° 45° (1993) 95° (1978) 0.11" NA
Sep 12 54° 77° 45° (1993) 94° (2000) 0.11" NA
Sep 13 54° 77° 45° (1985) 95° (1991) 0.11" NA
Sep 14 54° 77° 43° (1985) 94° (1991) 0.11" NA
Sep 15 53° 76° 41° (2007) 91° (1994) 0.11" NA
Sep 16 53° 76° 41° (1984) 90° (1994) 0.11" NA
Sep 17 53° 76° 41° (1984) 87° (1994) 0.1" NA
Sep 18 52° 75° 42° (1981) 92° (1988) 0.1" NA
Sep 19 52° 75° 39° (1991) 89° (2000) 0.1" NA
Sep 20 51° 75° 39° (1991) 92° (1978) 0.1" NA
Sep 21 51° 75° 37° (1983) 90° (1978) 0.1" NA
Sep 22 51° 74° 33° (1983) 89° (2007) 0.1" NA
Sep 23 50° 74° 32° (1983) 89° (1986) 0.1" NA
Sep 24 50° 73° 32° (1983) 86° (2007) 0.1" NA
Sep 25 50° 73° 35° (1983) 90° (2007) 0.1" NA
Sep 26 49° 73° 36° (1991) 90° (1986) 0.1" NA
Sep 27 49° 72° 36° (1991) 91° (1998) 0.1" NA
Sep 28 48° 72° 40° (1981) 87° (1986) 0.09" NA
Sep 29 48° 72° 36° (1984) 85° (1986) 0.09" NA
Sep 30 47° 71° 34° (1984) 86° (2002) 0.09" NA
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