Harpers Ferry Iowa Climate Data

Monthly Average Climate Data for Harpers Ferry Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-12 °C-2.6 °C32.51 mm
February-10.1 °C0 °C30.23 mm
March-3.7 °C6.8 °C50.8 mm
April2.6 °C14.9 °C96.77 mm
May9 °C21.4 °C120.4 mm
June14.6 °C26.7 °C139.95 mm
July17 °C28.7 °C112.27 mm
August15.8 °C27.6 °C100.08 mm
September11.2 °C23.7 °C96.52 mm
October4.5 °C16.3 °C66.29 mm
November-2.2 °C7.6 °C51.82 mm
December-7.9 °C0.4 °C38.1 mm
Annual3.2 °C14.3 °C935.74 mm

Climate Data for Harpers Ferry 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 5a : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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