Norwalk Iowa Climate Data

Monthly Average Climate Data for Norwalk Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.2 °F30.8 °F1.02 in.
February17.1 °F35.5 °F1.25 in.
March28.0 °F48.4 °F2.04 in.
April39.3 °F61.6 °F3.67 in.
May51.3 °F71.9 °F5.16 in.
June61.5 °F81.5 °F5.12 in.
July65.5 °F85.5 °F4.11 in.
August63.0 °F83.8 °F4.1 in.
September54.1 °F77.1 °F3.44 in.
October41.8 °F64.0 °F2.57 in.
November29.6 °F48.8 °F1.79 in.
December18.9 °F35.9 °F1.44 in.
Annual40.3 °F60.4 °F35.71 in.

Climate Data for Norwalk 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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