Grand River Iowa Climate Data

Monthly Average Climate Data for Grand River Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.1 °F32.1 °F0.93 in.
February16.9 °F36.8 °F1.36 in.
March27.8 °F49.7 °F2.19 in.
April38.3 °F61.8 °F4.05 in.
May49.9 °F71.6 °F5.43 in.
June60.0 °F81.1 °F5.16 in.
July64.4 °F85.5 °F4.41 in.
August61.8 °F83.9 °F4.28 in.
September52.6 °F76.7 °F3.91 in.
October40.6 °F64.4 °F2.85 in.
November28.6 °F49.5 °F2.09 in.
December18.7 °F37.0 °F1.44 in.
Annual39.4 °F60.8 °F38.1 in.

Climate Data for Grand River Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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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