O'Fallon, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 23° 43° -27° (1977) 75° (1950) 2.29" 3.3"
February 27° 48° -21° (1982) 81° (2000) 2.31" 3.3"
March 36° 59° -8° (1978) 89° (1997) 3.2" 1.4"
April 46° 70° 18° (2007) 91° (2007) 3.86" 0.2"
May 56° 78° 28° (1976) 97° (1953) 4.9" 0"
June 64° 87° 38° (1972) 104° (1952) 4.26" 0"
July 68° 91° 43° (1972) 110° (1954) 4.05" 0"
August 66° 90° 39° (1986) 105° (2007) 3.3" 0"
September 56° 83° 26° (1995) 103° (1954) 3.28" 0"
October 46° 72° 20° (1981) 95° (1953) 3.44" 0"
November 37° 59° 2° (1991) 84° (1950) 3.92" 0.3"
December 27° 45° -19° (1989) 76° (1970) 2.91" 3.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 31° 50° 11° (2002) 75° (1970) 0.11" 0.1"
Dec 2 30° 50° 11° (1985) 74° (1982) 0.11" 0.1"
Dec 3 30° 49° 12° (1976) 76° (1970) 0.11" 0"
Dec 4 30° 49° 11° (1991) 74° (1970) 0.1" 0.1"
Dec 5 29° 48° 14° (2008) 71° (1956) 0.1" 0.1"
Dec 6 29° 48° 5° (1977) 68° (1951) 0.1" 0.1"
Dec 7 29° 47° 5° (1950) 71° (1966) 0.11" 0"
Dec 8 28° 47° 8° (2006) 68° (1966) 0.1" 0.1"
Dec 9 28° 47° -2° (2005) 66° (1965) 0.1" 0.1"
Dec 10 28° 46° 1° (1995) 66° (1971) 0.09" 0.1"
Dec 11 27° 46° 2° (1962) 72° (1949) 0.1" 0.1"
Dec 12 27° 46° -7° (1962) 67° (2006) 0.09" 0.1"
Dec 13 27° 45° -1° (1962) 69° (1948) 0.1" 0.1"
Dec 14 27° 45° 0° (1985) 67° (2006) 0.09" 0.1"
Dec 15 26° 45° -2° (1989) 75° (1948) 0.09" 0.1"
Dec 16 26° 45° -14° (1989) 69° (1984) 0.08" 0.1"
Dec 17 26° 44° -12° (1989) 66° (1984) 0.09" 0.1"
Dec 18 26° 44° -5° (1963) 65° (1984) 0.08" 0.2"
Dec 19 26° 44° -5° (1963) 66° (1976) 0.09" 0.1"
Dec 20 25° 44° -15° (1989) 69° (1988) 0.08" 0.1"
Dec 21 25° 43° -6° (1989) 64° (1949) 0.1" 0.2"
Dec 22 25° 43° -19° (1989) 65° (1965) 0.09" 0.1"
Dec 23 25° 43° -16° (1989) 68° (1982) 0.09" 0.1"
Dec 24 25° 43° -14° (1989) 69° (1955) 0.09" 0.1"
Dec 25 24° 43° -9° (1983) 63° (1982) 0.09" 0.2"
Dec 26 24° 43° 0° (1948) 65° (1971) 0.09" 0.1"
Dec 27 24° 43° 4° (1950) 69° (1971) 0.09" 0.2"
Dec 28 24° 43° -1° (2000) 72° (1984) 0.09" 0.1"
Dec 29 24° 43° -4° (1983) 69° (1984) 0.09" 0.1"
Dec 30 24° 42° -8° (1983) 68° (1965) 0.08" 0.1"
Dec 31 24° 42° -6° (1976) 72° (1951) 0.09" 0.1"
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