Chillicothe Illinois Climate Data

Monthly Average Climate Data for Chillicothe Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.8 °C0.2 °C52.07 mm
February-6.9 °C2.7 °C47.75 mm
March-1.4 °C9.7 °C63.75 mm
April4.5 °C17.2 °C96.27 mm
May10.8 °C23.2 °C126.75 mm
June16.1 °C28.1 °C103.89 mm
July18.2 °C29.8 °C90.93 mm
August17 °C29.1 °C93.47 mm
September12.4 °C25.8 °C87.12 mm
October5.9 °C18.8 °C75.44 mm
November-0.2 °C10.3 °C66.55 mm
December-5.6 °C3.2 °C52.07 mm
Annual5.2 °C16.5 °C956.06 mm

Climate Data for Chillicothe Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 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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