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
May 1 11.1° 22.2° 1° (1978) 32.8° (2007) 0.13" NA
May 2 11.1° 22.2° 3° (1978) 32° (1987) 0.13" NA
May 3 11.7° 22.8° 2° (1976) 28° (1969) 0.13" NA
May 4 11.7° 22.8° 4° (1976) 31° (1987) 0.13" NA
May 5 11.7° 22.8° 4° (1990) 29° (1969) 0.13" NA
May 6 12.2° 23.3° 3° (1976) 31° (1977) 0.13" NA
May 7 12.2° 23.3° 3° (1989) 32° (2004) 0.13" NA
May 8 12.2° 23.3° 3° (1989) 31° (1970) 0.13" NA
May 9 12.8° 23.9° 7° (1976) 31° (1970) 0.13" NA
May 10 12.8° 23.9° 5° (1978) 32° (1996) 0.13" NA
May 11 12.8° 23.9° 6° (1989) 31° (2005) 0.13" NA
May 12 13.3° 24.4° 6° (1989) 31° (1987) 0.13" NA
May 13 13.3° 24.4° 6.1° (2006) 31° (1970) 0.13" NA
May 14 13.3° 24.4° 4° (1975) 31° (1987) 0.13" NA
May 15 13.3° 24.4° 8° (2005) 33° (1987) 0.13" NA
May 16 13.9° 25° 4° (1997) 32° (1987) 0.13" NA
May 17 13.9° 25° 8° (1993) 32° (1977) 0.13" NA
May 18 13.9° 25° 8° (1976) 33° (1996) 0.13" NA
May 19 14.4° 25.6° 9° (1976) 35° (1996) 0.13" NA
May 20 14.4° 25.6° 8° (1997) 34° (1996) 0.13" NA
May 21 14.4° 25.6° 8° (1993) 34° (1987) 0.12" NA
May 22 15° 26.1° 9° (1997) 34° (1987) 0.12" NA
May 23 15° 26.1° 9° (1997) 33° (1975) 0.12" NA
May 24 15° 26.1° 9° (1992) 34° (1975) 0.12" NA
May 25 15.6° 26.7° 8° (1988) 33.3° (2006) 0.12" NA
May 26 15.6° 26.7° 8° (1988) 33° (1977) 0.12" NA
May 27 15.6° 26.7° 8° (1992) 33° (1972) 0.12" NA
May 28 16.1° 27.2° 5° (1992) 34° (1991) 0.12" NA
May 29 16.1° 27.2° 13° (1976) 34.4° (2006) 0.12" NA
May 30 16.1° 27.2° 10° (1992) 33.9° (2006) 0.12" NA
May 31 16.7° 27.8° 11° (1972) 34° (1989) 0.12" NA
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