River Sioux Iowa Climate Data

Monthly Average Climate Data for River Sioux Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.2 °F30.8 °F0.76 in.
February15.0 °F35.5 °F0.98 in.
March26.2 °F49.0 °F1.97 in.
April37.0 °F62.3 °F3.65 in.
May49.6 °F72.9 °F4.64 in.
June60.4 °F83.0 °F5.12 in.
July64.1 °F86.3 °F3.79 in.
August61.2 °F84.0 °F4.23 in.
September52.0 °F78.0 °F3.8 in.
October39.0 °F64.7 °F2.49 in.
November26.3 °F49.2 °F1.58 in.
December16.1 °F35.3 °F1.31 in.
Annual38.2 °F60.9 °F34.32 in.

Climate Data for River Sioux 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 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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