Calmar Iowa Climate Data

Monthly Average Climate Data for Calmar Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.5 °F24.2 °F1.04 in.
February10.9 °F28.5 °F1.11 in.
March23.0 °F41.6 °F1.97 in.
April34.7 °F56.4 °F3.95 in.
May46.7 °F68.2 °F4.75 in.
June57.7 °F77.6 °F6.12 in.
July60.9 °F80.8 °F4.63 in.
August58.3 °F78.9 °F4.27 in.
September50.0 °F72.7 °F3.78 in.
October37.6 °F59.5 °F2.81 in.
November25.8 °F43.2 °F1.87 in.
December14.3 °F30.0 °F1.43 in.
Annual35.6 °F55.1 °F37.73 in.

Climate Data for Calmar Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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