Alton Missouri Climate Data

Monthly Average Climate Data for Alton Missouri

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.3 °F45.0 °F3.04 in.
February26.4 °F49.8 °F3.22 in.
March34.5 °F59.5 °F4.46 in.
April44.3 °F70.3 °F5.4 in.
May54.0 °F77.2 °F5.47 in.
June62.5 °F85.2 °F3.58 in.
July66.3 °F89.4 °F3.99 in.
August64.9 °F89.0 °F3.76 in.
September56.3 °F81.8 °F3.73 in.
October44.1 °F70.9 °F3.71 in.
November34.4 °F58.3 °F4.5 in.
December26.5 °F47.5 °F3.61 in.
Annual44.8 °F68.7 °F48.47 in.

Climate Data for Alton Missouri

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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 ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate