Grand River Iowa Climate Data

Monthly Average Climate Data for Grand River Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.5 °C0.1 °C23.62 mm
February-8.4 °C2.7 °C34.54 mm
March-2.3 °C9.8 °C55.63 mm
April3.5 °C16.6 °C102.87 mm
May9.9 °C22 °C137.92 mm
June15.6 °C27.3 °C131.06 mm
July18 °C29.7 °C112.01 mm
August16.6 °C28.8 °C108.71 mm
September11.4 °C24.8 °C99.31 mm
October4.8 °C18 °C72.39 mm
November-1.9 °C9.7 °C53.09 mm
December-7.4 °C2.8 °C36.58 mm
Annual4.1 °C16 °C967.73 mm

Climate Data for Grand River 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 : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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