Wilmette Illinois Climate Data

Monthly Average Climate Data for Wilmette Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.1 °F32.0 °F2.24 in.
February22.0 °F35.8 °F2.15 in.
March30.5 °F45.4 °F2.21 in.
April40.3 °F56.9 °F3.84 in.
May50.5 °F67.9 °F4.59 in.
June60.7 °F77.8 °F4.38 in.
July67.4 °F82.4 °F3.78 in.
August67.0 °F80.9 °F4.12 in.
September59.6 °F74.5 °F3.57 in.
October47.0 °F62.6 °F3.53 in.
November35.3 °F48.6 °F2.65 in.
December25.1 °F37.3 °F2.33 in.
Annual43.7 °F58.5 °F39.39 in.

Climate Data for Wilmette 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
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