Willowbrook Illinois Climate Data

Monthly Average Climate Data for Willowbrook Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.2 °F32.0 °F2.24 in.
February18.9 °F35.9 °F2.12 in.
March28.3 °F47.6 °F2.4 in.
April38.7 °F60.4 °F4.01 in.
May49.6 °F71.5 °F4.84 in.
June59.7 °F81.4 °F4.5 in.
July64.4 °F85.7 °F4.12 in.
August62.9 °F83.6 °F4.17 in.
September55.1 °F77.1 °F3.3 in.
October42.8 °F63.8 °F3.57 in.
November31.8 °F48.8 °F2.56 in.
December21.9 °F36.7 °F2.29 in.
Annual40.9 °F60.4 °F40.12 in.

Climate Data for Willowbrook Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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