Decatur City Iowa Climate Data

Monthly Average Climate Data for Decatur City Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.2 °F31.7 °F0.99 in.
February17.1 °F36.6 °F1.41 in.
March27.9 °F49.2 °F2.25 in.
April38.6 °F61.2 °F4.01 in.
May50.4 °F71.0 °F5.4 in.
June60.5 °F80.5 °F5.19 in.
July64.7 °F84.9 °F4.53 in.
August62.2 °F83.3 °F4.37 in.
September53.1 °F76.0 °F3.8 in.
October40.9 °F63.8 °F3.02 in.
November28.9 °F49.0 °F2.06 in.
December18.8 °F36.7 °F1.47 in.
Annual39.7 °F60.3 °F38.5 in.

Climate Data for Decatur City Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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