Harpers Ferry Iowa Climate Data

Monthly Average Climate Data for Harpers Ferry Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.4 °F27.4 °F1.28 in.
February13.8 °F32.0 °F1.19 in.
March25.4 °F44.3 °F2.0 in.
April36.6 °F58.9 °F3.81 in.
May48.2 °F70.5 °F4.74 in.
June58.3 °F80.0 °F5.51 in.
July62.6 °F83.6 °F4.42 in.
August60.5 °F81.7 °F3.94 in.
September52.1 °F74.6 °F3.8 in.
October40.1 °F61.4 °F2.61 in.
November28.0 °F45.6 °F2.04 in.
December17.7 °F32.7 °F1.5 in.
Annual37.8 °F57.7 °F36.84 in.

Climate Data for Harpers Ferry Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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