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
Jun 1 17° 28° 9° (1992) 33° (1987) 0.16" NA
Jun 2 17° 28° 11° (1975) 34° (1989) 0.16" NA
Jun 3 17° 28° 10° (1969) 33° (2009) 0.16" NA
Jun 4 18° 28° 9° (1990) 33° (1991) 0.16" NA
Jun 5 18° 28° 9° (1993) 33° (1971) 0.16" NA
Jun 6 18° 28° 9° (1998) 37° (1977) 0.17" NA
Jun 7 18° 29° 11° (1998) 35° (1969) 0.16" NA
Jun 8 18° 29° 12° (1975) 34° (1969) 0.16" NA
Jun 9 18° 29° 11° (1977) 34° (2005) 0.16" NA
Jun 10 19° 29° 9° (1972) 36° (1972) 0.15" NA
Jun 11 19° 29° 10° (1972) 35° (1977) 0.15" NA
Jun 12 19° 29° 12° (1995) 35° (1977) 0.16" NA
Jun 13 19° 29° 12° (1995) 35° (2010) 0.15" NA
Jun 14 19° 30° 14° (1995) 36° (1987) 0.14" NA
Jun 15 19° 30° 13° (1969) 38° (1987) 0.15" NA
Jun 16 20° 30° 10° (1989) 35° (1991) 0.15" NA
Jun 17 20° 30° 12° (1999) 37° (1987) 0.15" NA
Jun 18 20° 30° 13° (1999) 36° (1990) 0.14" NA
Jun 19 20° 30° 12° (1969) 36° (1971) 0.15" NA
Jun 20 20° 30° 4° (1976) 37° (1971) 0.14" NA
Jun 21 20° 30° 11° (1992) 37° (2010) 0.15" NA
Jun 22 20° 31° 10° (1992) 37° (1988) 0.14" NA
Jun 23 20° 31° 12° (1974) 38° (1988) 0.14" NA
Jun 24 21° 31° 12° (1974) 37° (2009) 0.13" NA
Jun 25 21° 31° 13° (1974) 39° (1988) 0.13" NA
Jun 26 21° 31° 13° (2004) 38° (1971) 0.12" NA
Jun 27 21° 31° 13° (1992) 38° (1971) 0.12" NA
Jun 28 21° 31° 14° (1987) 38° (1971) 0.11" NA
Jun 29 21° 31° 15° (2004) 36° (1998) 0.11" NA
Jun 30 21° 31° 15° (1972) 38° (2005) 0.11" NA
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