Afton Iowa Climate Data

Monthly Average Climate Data for Afton Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.9 °F31.2 °F0.91 in.
February17.0 °F36.3 °F1.29 in.
March27.5 °F49.0 °F2.1 in.
April38.5 °F61.4 °F3.68 in.
May50.3 °F71.3 °F5.34 in.
June60.5 °F80.6 °F5.0 in.
July64.5 °F84.8 °F4.21 in.
August62.2 °F83.4 °F4.11 in.
September53.1 °F76.1 °F3.75 in.
October40.8 °F63.8 °F2.71 in.
November28.9 °F48.8 °F2.02 in.
December18.4 °F36.1 °F1.38 in.
Annual39.6 °F60.2 °F36.5 in.

Climate Data for Afton Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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