Harper Iowa Climate Data

Monthly Average Climate Data for Harper Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.9 °F30.0 °F1.23 in.
February16.6 °F34.7 °F1.5 in.
March27.4 °F47.8 °F2.26 in.
April38.6 °F61.1 °F3.78 in.
May50.6 °F71.5 °F5.05 in.
June61.0 °F81.1 °F5.29 in.
July64.3 °F84.7 °F4.14 in.
August61.7 °F82.9 °F4.42 in.
September52.8 °F76.5 °F3.54 in.
October40.9 °F63.7 °F2.85 in.
November29.2 °F48.3 °F2.17 in.
December18.9 °F35.4 °F1.62 in.
Annual39.6 °F59.8 °F37.85 in.

Climate Data for Harper Iowa

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