Cromwell Iowa Climate Data

Monthly Average Climate Data for Cromwell Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.9 °F30.9 °F0.85 in.
February17.0 °F36.1 °F1.23 in.
March27.4 °F48.8 °F2.01 in.
April38.5 °F61.4 °F3.47 in.
May50.4 °F71.3 °F5.17 in.
June60.6 °F80.7 °F5.0 in.
July64.5 °F84.7 °F3.92 in.
August62.3 °F83.4 °F4.14 in.
September53.2 °F76.1 °F3.8 in.
October40.9 °F63.7 °F2.63 in.
November28.8 °F48.6 °F1.93 in.
December18.3 °F35.8 °F1.26 in.
Annual39.6 °F60.1 °F35.41 in.

Climate Data for Cromwell Iowa

Average First Frost DateOct. 1 - Oct. 10
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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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