Onawa Iowa Climate Data

Monthly Average Climate Data for Onawa Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.9 °F30.6 °F0.67 in.
February14.9 °F35.4 °F0.84 in.
March25.9 °F48.9 °F1.64 in.
April36.8 °F62.4 °F3.53 in.
May49.2 °F73.2 °F4.6 in.
June60.1 °F82.9 °F4.59 in.
July63.8 °F86.1 °F3.8 in.
August61.1 °F83.9 °F4.04 in.
September51.9 °F78.0 °F3.09 in.
October39.0 °F65.3 °F2.25 in.
November26.1 °F48.8 °F1.38 in.
December15.8 °F35.1 °F1.11 in.
Annual38 °F60.9 °F31.54 in.

Climate Data for Onawa Iowa

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