Harper Iowa Climate Data

Monthly Average Climate Data for Harper Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.6 °C-1.1 °C31.24 mm
February-8.6 °C1.5 °C38.1 mm
March-2.6 °C8.8 °C57.4 mm
April3.7 °C16.2 °C96.01 mm
May10.3 °C21.9 °C128.27 mm
June16.1 °C27.3 °C134.37 mm
July17.9 °C29.3 °C105.16 mm
August16.5 °C28.3 °C112.27 mm
September11.6 °C24.7 °C89.92 mm
October4.9 °C17.6 °C72.39 mm
November-1.6 °C9.1 °C55.12 mm
December-7.3 °C1.9 °C41.15 mm
Annual4.2 °C15.5 °C961.4 mm

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 : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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