Hartley Iowa Climate Data

Monthly Average Climate Data for Hartley Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January6.9 °F24.5 °F0.69 in.
February11.0 °F28.9 °F0.8 in.
March22.7 °F41.8 °F1.6 in.
April34.5 °F57.2 °F3.3 in.
May47.3 °F69.4 °F4.33 in.
June58.3 °F79.5 °F4.9 in.
July62.0 °F83.1 °F3.59 in.
August59.5 °F80.5 °F3.43 in.
September50.6 °F74.2 °F3.22 in.
October37.5 °F60.5 °F2.36 in.
November24.2 °F43.5 °F1.45 in.
December12.9 °F29.5 °F0.95 in.
Annual35.6 °F56.1 °F30.62 in.

Climate Data for Hartley Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 1 - May 10
Average Days With Frost150-180 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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