Glen Ellyn Illinois Climate Data

Monthly Average Climate Data for Glen Ellyn Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.6 °F31.2 °F2.14 in.
February18.2 °F35.1 °F2.1 in.
March27.7 °F46.7 °F2.32 in.
April38.0 °F59.5 °F3.89 in.
May49.0 °F70.9 °F4.86 in.
June59.1 °F80.6 °F4.56 in.
July64.0 °F84.7 °F3.76 in.
August62.4 °F82.7 °F4.19 in.
September54.5 °F76.0 °F3.37 in.
October42.3 °F62.9 °F3.5 in.
November31.2 °F48.3 °F2.59 in.
December21.4 °F36.3 °F2.27 in.
Annual40.3 °F59.6 °F39.55 in.

Climate Data for Glen Ellyn Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°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