Westmont Illinois Climate Data

Monthly Average Climate Data for Westmont Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.9 °F31.8 °F2.21 in.
February18.6 °F35.8 °F2.13 in.
March28.0 °F47.7 °F2.38 in.
April38.3 °F60.2 °F3.99 in.
May49.2 °F71.4 °F4.81 in.
June59.3 °F81.2 °F4.52 in.
July64.0 °F85.4 °F4.0 in.
August62.6 °F83.4 °F4.2 in.
September54.8 °F76.9 °F3.35 in.
October42.5 °F63.6 °F3.58 in.
November31.5 °F48.7 °F2.59 in.
December21.6 °F36.6 °F2.29 in.
Annual40.5 °F60.2 °F40.05 in.

Climate Data for Westmont 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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