Vandalia, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 18° 35° -21° (1985) 69° (1997) 2.49" NA
February 23° 41° -16° (1996) 77° (2000) 2.41" NA
March 32° 52° -9° (1978) 84° (1985) 3.72" NA
April 43° 64° 20° (1983) 89° (1987) 3.57" NA
May 53° 74° 31° (1976) 92° (2006) 4.11" NA
June 62° 83° 41° (1992) 101° (1988) 3.93" NA
July 67° 88° 49° (1975) 104° (1980) 3.61" NA
August 64° 86° 43° (1986) 104° (1983) 2.8" NA
September 55° 79° 30° (1995) 98° (1983) 2.97" NA
October 43° 67° 22° (1979) 91° (2007) 2.84" NA
November 34° 53° 5° (1977) 81° (2003) 3.7" NA
December 24° 40° -17° (1989) 72° (1982) 2.75" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 60° 83° 47° (1987) 96° (1980) 0.09" NA
Sep 2 60° 83° 49° (1994) 92° (1977) 0.1" NA
Sep 3 60° 83° 47° (1974) 94° (1984) 0.1" NA
Sep 4 59° 82° 44° (1974) 95° (2007) 0.1" NA
Sep 5 59° 82° 40° (1997) 96° (2007) 0.1" NA
Sep 6 59° 82° 48° (1988) 96° (1990) 0.1" NA
Sep 7 58° 82° 49° (1975) 97° (1990) 0.1" NA
Sep 8 58° 81° 40° (1986) 93° (2002) 0.1" NA
Sep 9 58° 81° 42° (1986) 97° (1983) 0.1" NA
Sep 10 57° 81° 45° (1976) 98° (1983) 0.1" NA
Sep 11 57° 81° 46° (1993) 97° (1983) 0.1" NA
Sep 12 57° 80° 47° (1976) 90° (1991) 0.1" NA
Sep 13 56° 80° 42° (1975) 92° (1980) 0.1" NA
Sep 14 56° 80° 42° (1974) 95° (1991) 0.1" NA
Sep 15 55° 79° 40° (2007) 94° (1991) 0.1" NA
Sep 16 55° 79° 39° (1979) 94° (1991) 0.1" NA
Sep 17 55° 79° 41° (1984) 90° (1997) 0.1" NA
Sep 18 54° 78° 42° (1990) 90° (1978) 0.1" NA
Sep 19 54° 78° 40° (1991) 95° (1983) 0.1" NA
Sep 20 54° 78° 35° (1991) 93° (1978) 0.1" NA
Sep 21 53° 77° 36° (1991) 91° (1978) 0.1" NA
Sep 22 53° 77° 35° (1983) 92° (1980) 0.1" NA
Sep 23 52° 77° 30° (1974) 91° (1980) 0.1" NA
Sep 24 52° 76° 30° (1995) 95° (2007) 0.1" NA
Sep 25 51° 76° 34° (1995) 91° (2007) 0.1" NA
Sep 26 51° 76° 36° (1984) 90° (1986) 0.1" NA
Sep 27 51° 75° 36° (1984) 90° (1986) 0.1" NA
Sep 28 50° 75° 38° (1991) 89° (1998) 0.1" NA
Sep 29 50° 75° 38° (1984) 91° (1986) 0.09" NA
Sep 30 49° 74° 35° (1984) 88° (1986) 0.09" NA
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