Affton, Missouri
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -5° -23.3° (1977) 23.3° (1970) 2.45" NA
February -2° -25° (1996) 26.1° (1976) 2.48" NA
March 13° -16.7° (1978) 31.1° (1997) 3.36" NA
April 20° -6.7° (1975) 33.9° (2006) 4.1" NA
May 14° 25° 1.1° (1978) 35° (1996) 4.8" NA
June 19° 30° 4.4° (1976) 38.9° (1988) 4.34" NA
July 22° 32° 11.7° (1975) 40.6° (1999) 4.19" NA
August 21° 31° 10.6° (1992) 40° (2003) 3.41" NA
September 16° 27° 1.7° (1969) 37.2° (1990) 3.38" NA
October 10° 21° -2.2° (1987) 34.4° (2006) 3.43" NA
November 13° -13.9° (1976) 28.3° (2003) 4.22" NA
December -2° -27.2° (1989) 25.6° (1970) 2.96" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jul 1 21° 31° 16° (1988) 37° (2005) 0.13" NA
Jul 2 21° 31° 14° (1995) 37° (1970) 0.13" NA
Jul 3 21° 31° 17.2° (2007) 38° (1970) 0.13" NA
Jul 4 21° 32° 17° (1992) 37° (1969) 0.12" NA
Jul 5 21° 32° 13° (1997) 38° (1990) 0.13" NA
Jul 6 21° 32° 12° (1972) 37° (1977) 0.13" NA
Jul 7 22° 32° 16° (1972) 38° (1977) 0.14" NA
Jul 8 22° 32° 16° (1987) 37° (1977) 0.14" NA
Jul 9 22° 32° 17° (1994) 37° (1971) 0.13" NA
Jul 10 22° 32° 15° (1996) 37° (1990) 0.13" NA
Jul 11 22° 32° 12° (1975) 37° (1976) 0.12" NA
Jul 12 22° 32° 16° (1975) 37° (1976) 0.13" NA
Jul 13 22° 32° 12° (1975) 37° (1995) 0.12" NA
Jul 14 22° 32° 14° (1990) 38° (1977) 0.14" NA
Jul 15 22° 32° 15° (1987) 38° (1988) 0.13" NA
Jul 16 22° 32° 15° (1990) 38° (1988) 0.14" NA
Jul 17 22° 32° 16° (1987) 38° (1988) 0.14" NA
Jul 18 22° 32° 17° (1976) 38° (1988) 0.14" NA
Jul 19 22° 32° 16° (1976) 37° (1977) 0.13" NA
Jul 20 22° 32° 16° (2009) 37.8° (2006) 0.14" NA
Jul 21 22° 32° 15° (1970) 37° (1998) 0.13" NA
Jul 22 22° 32° 16° (1970) 37° (1976) 0.13" NA
Jul 23 22° 32° 17° (1970) 38° (1976) 0.14" NA
Jul 24 22° 32° 17° (1990) 38° (1976) 0.14" NA
Jul 25 22° 32° 14° (1975) 38° (2005) 0.14" NA
Jul 26 22° 32° 16° (2003) 38° (1999) 0.14" NA
Jul 27 22° 32° 14° (2004) 39° (1999) 0.14" NA
Jul 28 22° 32° 15° (1994) 37° (1997) 0.14" NA
Jul 29 22° 32° 15° (1994) 37° (1970) 0.15" NA
Jul 30 22° 32° 15° (1991) 41° (1999) 0.15" NA
Jul 31 22° 32° 14° (1971) 39° (1999) 0.15" NA
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