West Branch Iowa Climate Data

Monthly Average Climate Data for West Branch Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.0 °F29.6 °F1.28 in.
February16.6 °F34.1 °F1.53 in.
March27.5 °F47.2 °F2.32 in.
April38.7 °F61.3 °F3.75 in.
May50.5 °F72.0 °F4.74 in.
June60.6 °F81.2 °F5.2 in.
July64.1 °F84.5 °F4.31 in.
August61.6 °F82.7 °F4.22 in.
September53.0 °F76.7 °F3.53 in.
October41.1 °F63.6 °F2.96 in.
November29.2 °F48.2 °F2.22 in.
December18.9 °F34.9 °F1.72 in.
Annual39.6 °F59.7 °F37.78 in.

Climate Data for West Branch Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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