Duncan Iowa Climate Data

Monthly Average Climate Data for Duncan Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.1 °F24.0 °F0.84 in.
February11.5 °F28.6 °F0.98 in.
March23.5 °F41.3 °F2.06 in.
April35.0 °F56.6 °F3.85 in.
May47.6 °F68.9 °F4.71 in.
June58.3 °F78.8 °F5.22 in.
July61.5 °F81.8 °F4.08 in.
August58.7 °F79.4 °F3.84 in.
September50.0 °F73.3 °F3.11 in.
October37.6 °F60.1 °F2.3 in.
November25.4 °F43.5 °F1.68 in.
December13.8 °F29.7 °F1.29 in.
Annual35.8 °F55.5 °F33.96 in.

Climate Data for Duncan 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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