Grantfork Illinois Climate Data

Monthly Average Climate Data for Grantfork Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.6 °C3.4 °C68.83 mm
February-3.7 °C6.4 °C60.2 mm
March1.3 °C12.3 °C85.09 mm
April7.1 °C18.9 °C124.46 mm
May13.1 °C24.1 °C128.02 mm
June18.1 °C29.1 °C119.13 mm
July20.1 °C30.8 °C108.46 mm
August18.8 °C30.3 °C92.96 mm
September14.2 °C26.8 °C84.07 mm
October7.7 °C20.3 °C84.84 mm
November1.8 °C12.3 °C93.73 mm
December-2.9 °C6.1 °C70.87 mm
Annual7.5 °C18.4 °C1120.66 mm

Climate Data for Grantfork Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 6b : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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