Knoxville Illinois Climate Data

Monthly Average Climate Data for Knoxville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.3 °F30.9 °F1.83 in.
February17.7 °F35.5 °F2.01 in.
March28.2 °F48.5 °F2.48 in.
April38.8 °F61.5 °F3.92 in.
May51.0 °F72.2 °F5.25 in.
June60.8 °F81.1 °F4.77 in.
July64.2 °F84.0 °F4.02 in.
August62.0 °F82.5 °F3.69 in.
September53.6 °F76.6 °F3.92 in.
October41.9 °F64.0 °F2.94 in.
November30.4 °F49.0 °F2.51 in.
December20.3 °F36.4 °F2.06 in.
Annual40.3 °F60.2 °F39.4 in.

Climate Data for Knoxville 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 5b : -15°F to -10°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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