Irwin Iowa Climate Data

Monthly Average Climate Data for Irwin Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.9 °F29.2 °F0.8 in.
February15.0 °F34.1 °F1.03 in.
March25.8 °F47.4 °F1.87 in.
April36.7 °F60.8 °F3.53 in.
May49.2 °F71.4 °F4.87 in.
June59.7 °F81.0 °F4.99 in.
July63.4 °F84.2 °F3.85 in.
August60.6 °F82.2 °F4.21 in.
September51.4 °F76.3 °F3.41 in.
October39.5 °F63.7 °F2.62 in.
November26.7 °F47.2 °F1.47 in.
December16.6 °F34.3 °F1.27 in.
Annual38 °F59.3 °F33.92 in.

Climate Data for Irwin 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 5a : -20°F to -15°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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