Sumner Iowa Climate Data

Monthly Average Climate Data for Sumner Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January8.2 °F25.4 °F1.1 in.
February12.1 °F29.5 °F1.13 in.
March24.0 °F42.9 °F1.99 in.
April35.6 °F57.6 °F3.9 in.
May47.8 °F69.6 °F4.9 in.
June58.6 °F79.3 °F6.02 in.
July61.6 °F82.1 °F4.77 in.
August59.1 °F80.2 °F4.1 in.
September50.5 °F74.2 °F3.79 in.
October38.2 °F60.9 °F2.82 in.
November26.0 °F44.4 °F1.91 in.
December14.9 °F31.0 °F1.55 in.
Annual36.4 °F56.4 °F37.98 in.

Climate Data for Sumner Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
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 ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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