Illinois City Illinois Climate Data

Monthly Average Climate Data for Illinois City Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.1 °C-1.1 °C35.05 mm
February-8.1 °C1.4 °C42.67 mm
March-2.2 °C8.6 °C60.96 mm
April4.1 °C16 °C92.2 mm
May10.6 °C22.1 °C124.21 mm
June16.1 °C27.3 °C128.02 mm
July18.1 °C29 °C103.89 mm
August16.9 °C27.9 °C101.35 mm
September12.3 °C24.6 °C91.44 mm
October5.7 °C17.4 °C72.39 mm
November-0.9 °C9.1 °C55.63 mm
December-6.7 °C1.8 °C47.24 mm
Annual4.7 °C15.3 °C955.05 mm

Climate Data for Illinois City Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°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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