Chillicothe Illinois Climate Data

Monthly Average Climate Data for Chillicothe Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.2 °F32.4 °F2.05 in.
February19.6 °F36.9 °F1.88 in.
March29.5 °F49.4 °F2.51 in.
April40.1 °F62.9 °F3.79 in.
May51.4 °F73.7 °F4.99 in.
June61.0 °F82.6 °F4.09 in.
July64.7 °F85.7 °F3.58 in.
August62.6 °F84.3 °F3.68 in.
September54.3 °F78.5 °F3.43 in.
October42.7 °F65.8 °F2.97 in.
November31.7 °F50.5 °F2.62 in.
December22.0 °F37.7 °F2.05 in.
Annual41.3 °F61.7 °F37.64 in.

Climate Data for Chillicothe Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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