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
Sep 1 18.3° 29.4° 14° (1987) 34° (1969) 0.11" NA
Sep 2 18.3° 29.4° 12° (1974) 35° (1975) 0.1" NA
Sep 3 18.3° 28.9° 10° (1974) 36° (2002) 0.1" NA
Sep 4 17.8° 28.9° 10° (1974) 36° (1999) 0.1" NA
Sep 5 17.8° 28.9° 11° (1997) 36° (1990) 0.1" NA
Sep 6 17.8° 28.9° 9° (1988) 37° (1990) 0.1" NA
Sep 7 17.2° 28.3° 11° (1988) 37° (1990) 0.1" NA
Sep 8 17.2° 28.3° 12° (1987) 37° (1970) 0.1" NA
Sep 9 17.2° 28.3° 12° (1998) 35° (1971) 0.1" NA
Sep 10 17.2° 27.8° 12° (1969) 36° (1971) 0.09" NA
Sep 11 16.7° 27.8° 11° (1992) 35° (2002) 0.09" NA
Sep 12 16.7° 27.8° 12° (1968) 33° (1972) 0.09" NA
Sep 13 16.7° 27.8° 10° (1975) 34° (1971) 0.09" NA
Sep 14 16.1° 27.2° 8° (1996) 37° (1971) 0.09" NA
Sep 15 16.1° 27.2° 8.3° (2007) 34° (1994) 0.09" NA
Sep 16 16.1° 27.2° 11° (1993) 32° (1970) 0.09" NA
Sep 17 15.6° 26.7° 9° (1999) 34° (1997) 0.09" NA
Sep 18 15.6° 26.7° 7° (1973) 33° (1988) 0.09" NA
Sep 19 15.6° 26.7° 9° (1973) 34° (1972) 0.09" NA
Sep 20 15° 26.1° 6.7° (2006) 34° (1972) 0.08" NA
Sep 21 15° 26.1° 6° (1974) 33° (1972) 0.08" NA
Sep 22 15° 26.1° 4° (1995) 32° (1970) 0.08" NA
Sep 23 14.4° 26.1° 3° (1995) 33° (1988) 0.08" NA
Sep 24 14.4° 25.6° 3° (1995) 34.4° (2007) 0.08" NA
Sep 25 14.4° 25.6° 2° (1969) 32.2° (2007) 0.08" NA
Sep 26 13.9° 25° 8° (1975) 32° (1999) 0.08" NA
Sep 27 13.9° 25° 7° (1989) 33° (1998) 0.08" NA
Sep 28 13.3° 25° 6° (1989) 33° (1971) 0.08" NA
Sep 29 13.3° 24.4° 6° (2003) 34° (1971) 0.08" NA
Sep 30 13.3° 24.4° 5° (1992) 33° (1971) 0.08" NA
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