River Grove Illinois Climate Data

Monthly Average Climate Data for River Grove Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.9 °C-0.3 °C54.61 mm
February-6.4 °C1.8 °C52.83 mm
March-1.3 °C7.8 °C58.67 mm
April4.3 °C14.6 °C100.33 mm
May10.4 °C20.9 °C117.86 mm
June16.1 °C26.4 °C110.49 mm
July19.1 °C28.9 °C96.01 mm
August18.3 °C27.9 °C101.6 mm
September13.8 °C24.2 °C83.82 mm
October7 °C17.1 °C86.36 mm
November0.7 °C9.3 °C65.02 mm
December-4.8 °C2.8 °C57.66 mm
Annual5.8 °C15.1 °C985.26 mm

Climate Data for River Grove Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com