Affton Missouri Climate Data

Monthly Average Climate Data for Affton Missouri

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.2 °F40.5 °F2.78 in.
February27.6 °F45.9 °F2.51 in.
March36.3 °F56.1 °F3.62 in.
April47.0 °F68.1 °F4.71 in.
May57.7 °F76.9 °F5.32 in.
June66.6 °F85.5 °F4.65 in.
July70.5 °F89.1 °F4.17 in.
August68.4 °F87.7 °F3.82 in.
September60.5 °F81.1 °F3.39 in.
October49.3 °F69.4 °F3.57 in.
November37.6 °F55.2 °F3.72 in.
December29.0 °F44.7 °F2.8 in.
Annual47.9 °F66.7 °F45.06 in.

Climate Data for Affton Missouri

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCfa - Humid Subtropical Climate