Westmont Illinois Climate Data

Monthly Average Climate Data for Westmont Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.9 °C-0.1 °C56.13 mm
February-7.4 °C2.1 °C54.1 mm
March-2.2 °C8.7 °C60.45 mm
April3.5 °C15.7 °C101.35 mm
May9.6 °C21.9 °C122.17 mm
June15.2 °C27.3 °C114.81 mm
July17.8 °C29.7 °C101.6 mm
August17 °C28.6 °C106.68 mm
September12.7 °C24.9 °C85.09 mm
October5.8 °C17.6 °C90.93 mm
November-0.3 °C9.3 °C65.79 mm
December-5.8 °C2.6 °C58.17 mm
Annual4.8 °C15.7 °C1017.27 mm

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 : -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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