Illinois City Illinois Climate Data

Monthly Average Climate Data for Illinois City Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.8 °F30.1 °F1.38 in.
February17.4 °F34.5 °F1.68 in.
March28.1 °F47.4 °F2.4 in.
April39.3 °F60.8 °F3.63 in.
May51.1 °F71.7 °F4.89 in.
June61.0 °F81.1 °F5.04 in.
July64.6 °F84.2 °F4.09 in.
August62.4 °F82.3 °F3.99 in.
September54.2 °F76.3 °F3.6 in.
October42.3 °F63.4 °F2.85 in.
November30.4 °F48.4 °F2.19 in.
December19.9 °F35.3 °F1.86 in.
Annual40.4 °F59.6 °F37.6 in.

Climate Data for Illinois City Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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