Affton, Missouri
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -6° -23.3° (1977) 23.3° (1970) 2.01" NA
February -3° -25° (1996) 26.1° (1976) 2.06" NA
March 13° -16.7° (1978) 31.1° (1997) 3.7" NA
April 19° -6.7° (1975) 33.9° (2006) 3.82" NA
May 14° 25° 1.1° (1978) 35° (1996) 3.92" NA
June 19° 30° 4.4° (1976) 38.9° (1988) 3.73" NA
July 22° 33° 11.7° (1975) 40.6° (1999) 3.78" NA
August 21° 31° 10.6° (1992) 40° (2003) 3.7" NA
September 16° 27° 1.7° (1969) 37.2° (1990) 2.69" NA
October 21° -2.2° (1987) 34.4° (2006) 2.81" NA
November 12° -13.9° (1976) 28.3° (2003) 4.06" NA
December -3° -27.2° (1989) 25.6° (1970) 2.56" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 8.3° -7° (2002) 25° (1970) 0.12" NA
Dec 2 -0.6° 8.3° -7.2° (2006) 22° (1970) 0.11" NA
Dec 3 -0.6° 7.8° -12° (1974) 26° (1970) 0.11" NA
Dec 4 -0.6° 7.8° -12° (1974) 24° (1970) 0.11" NA
Dec 5 -1.1° 7.8° -10° (1974) 19° (1975) 0.1" NA
Dec 6 -1.1° 7.2° -18° (1977) 22° (1998) 0.1" NA
Dec 7 -1.1° 7.2° -14° (1977) 22° (1998) 0.1" NA
Dec 8 -1.7° 7.2° -14° (1977) 15° (1970) 0.09" NA
Dec 9 -1.7° 6.7° -17° (1995) 17° (1970) 0.09" NA
Dec 10 -1.7° 6.7° -17° (1977) 18° (1971) 0.09" NA
Dec 11 -2.2° 6.7° -13° (1972) 18° (1996) 0.09" NA
Dec 12 -2.2° 6.1° -14° (1989) 18° (1990) 0.09" NA
Dec 13 -2.2° 6.1° -12° (1989) 19° (1969) 0.08" NA
Dec 14 -2.8° 6.1° -14° (1989) 19° (1975) 0.08" NA
Dec 15 -2.8° 5.6° -21° (1989) 20° (1975) 0.08" NA
Dec 16 -2.8° 5.6° -22° (1989) 18° (1971) 0.08" NA
Dec 17 -3.3° 5.6° -19° (1989) 18.9° (2006) 0.08" NA
Dec 18 -3.3° -14° (1989) 17° (2002) 0.07" NA
Dec 19 -3.3° -14° (1996) 18° (1976) 0.07" NA
Dec 20 -3.3° -14° (1996) 19° (1976) 0.07" NA
Dec 21 -3.9° 4.4° -21° (1989) 19° (1988) 0.07" NA
Dec 22 -3.9° 4.4° -26° (1989) 16.7° (2006) 0.07" NA
Dec 23 -3.9° 4.4° -27° (1989) 15° (1988) 0.07" NA
Dec 24 -4.4° 4.4° -23° (1989) 18° (1996) 0.07" NA
Dec 25 -4.4° 3.9° -17° (1990) 15° (1971) 0.07" NA
Dec 26 -4.4° 3.9° -14° (1990) 16° (1971) 0.07" NA
Dec 27 -4.4° 3.9° -14° (1977) 21° (1971) 0.07" NA
Dec 28 -5° 3.9° -12° (1977) 18° (1976) 0.07" NA
Dec 29 -5° 3.9° -13° (1976) 15.6° (2006) 0.07" NA
Dec 30 -5° 3.3° -14° (1990) 17° (2004) 0.06" NA
Dec 31 -5° 3.3° -16° (1968) 21° (2002) 0.06" NA
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