Duncan Iowa Climate Data

Monthly Average Climate Data for Duncan Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-13.8 °C-4.4 °C21.34 mm
February-11.4 °C-1.9 °C24.89 mm
March-4.7 °C5.2 °C52.32 mm
April1.7 °C13.7 °C97.79 mm
May8.7 °C20.5 °C119.63 mm
June14.6 °C26 °C132.59 mm
July16.4 °C27.7 °C103.63 mm
August14.8 °C26.3 °C97.54 mm
September10 °C22.9 °C78.99 mm
October3.1 °C15.6 °C58.42 mm
November-3.7 °C6.4 °C42.67 mm
December-10.1 °C-1.3 °C32.77 mm
Annual2.1 °C13.1 °C862.58 mm

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 : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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