Downers Grove Illinois Climate Data

Monthly Average Climate Data for Downers Grove Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.9 °C-0.2 °C55.63 mm
February-7.4 °C2.1 °C54.1 mm
March-2.2 °C8.7 °C60.45 mm
April3.5 °C15.6 °C101.09 mm
May9.6 °C21.8 °C122.68 mm
June15.2 °C27.3 °C115.57 mm
July17.8 °C29.6 °C100.33 mm
August16.9 °C28.5 °C106.93 mm
September12.6 °C24.9 °C85.09 mm
October5.8 °C17.4 °C90.93 mm
November-0.3 °C9.3 °C66.04 mm
December-5.8 °C2.6 °C58.17 mm
Annual4.7 °C15.6 °C1017.01 mm

Climate Data for Downers 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation