Washington Iowa Climate Data

Monthly Average Climate Data for Washington Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.8 °F30.8 °F1.33 in.
February17.5 °F35.5 °F1.55 in.
March28.0 °F48.4 °F2.3 in.
April39.1 °F62.3 °F3.64 in.
May51.2 °F72.8 °F5.14 in.
June61.3 °F81.9 °F5.13 in.
July64.6 °F85.1 °F4.13 in.
August62.1 °F83.6 °F4.23 in.
September53.1 °F77.4 °F3.52 in.
October41.4 °F64.7 °F2.99 in.
November29.9 °F49.0 °F2.23 in.
December19.7 °F36.1 °F1.71 in.
Annual40.1 °F60.6 °F37.9 in.

Climate Data for Washington Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
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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