Oak Brook Illinois Climate Data

Monthly Average Climate Data for Oak Brook Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.6 °C-0.1 °C55.63 mm
February-7.1 °C2 °C54.61 mm
March-1.8 °C8.3 °C59.94 mm
April3.9 °C15.3 °C100.84 mm
May10 °C21.6 °C121.16 mm
June15.6 °C27.1 °C113.03 mm
July18.3 °C29.5 °C100.58 mm
August17.6 °C28.4 °C106.93 mm
September13.2 °C24.8 °C85.6 mm
October6.3 °C17.4 °C89.41 mm
November0.2 °C9.4 °C65.79 mm
December-5.3 °C2.8 °C58.42 mm
Annual5.2 °C15.5 °C1011.94 mm

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 : -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
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