Oak Brook Illinois Climate Data

Monthly Average Climate Data for Oak Brook Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.6 °F31.8 °F2.19 in.
February19.3 °F35.6 °F2.15 in.
March28.7 °F46.9 °F2.36 in.
April39.1 °F59.6 °F3.97 in.
May50.0 °F70.9 °F4.77 in.
June60.1 °F80.8 °F4.45 in.
July65.0 °F85.1 °F3.96 in.
August63.6 °F83.1 °F4.21 in.
September55.8 °F76.6 °F3.37 in.
October43.4 °F63.4 °F3.52 in.
November32.3 °F49.0 °F2.59 in.
December22.4 °F37.0 °F2.3 in.
Annual41.4 °F60 °F39.84 in.

Climate Data for Oak Brook 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 : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com