Decorah Iowa Climate Data

Monthly Average Climate Data for Decorah Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January8.4 °F25.5 °F0.99 in.
February11.8 °F30.0 °F1.09 in.
March23.8 °F42.8 °F1.95 in.
April35.2 °F58.0 °F3.96 in.
May46.9 °F69.7 °F4.8 in.
June57.3 °F79.2 °F6.12 in.
July60.9 °F82.5 °F4.43 in.
August58.7 °F80.5 °F4.35 in.
September50.5 °F74.2 °F3.65 in.
October38.2 °F61.1 °F2.72 in.
November26.6 °F44.5 °F1.87 in.
December15.6 °F31.2 °F1.37 in.
Annual36.2 °F56.6 °F37.3 in.

Climate Data for Decorah Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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