Northbrook Illinois Climate Data

Monthly Average Climate Data for Northbrook Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.9 °C-0.3 °C53.85 mm
February-6.4 °C1.7 °C50.8 mm
March-1.6 °C7.3 °C56.39 mm
April4.1 °C13.8 °C96.52 mm
May10.1 °C20.3 °C119.13 mm
June15.6 °C26 °C109.98 mm
July18.9 °C28.4 °C92.71 mm
August18.3 °C27.5 °C103.63 mm
September14 °C23.9 °C87.63 mm
October7.3 °C16.9 °C87.88 mm
November0.9 °C8.9 °C66.04 mm
December-4.6 °C2.7 °C56.9 mm
Annual5.7 °C14.8 °C981.46 mm

Climate Data for Northbrook 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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