Cornell Illinois Climate Data

Monthly Average Climate Data for Cornell Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.0 °F31.8 °F2.05 in.
February19.3 °F36.4 °F1.82 in.
March28.9 °F48.7 °F2.58 in.
April39.5 °F62.2 °F3.59 in.
May51.2 °F73.2 °F4.55 in.
June60.8 °F81.8 °F4.27 in.
July64.3 °F84.6 °F3.97 in.
August62.1 °F82.8 °F3.62 in.
September53.9 °F77.7 °F3.37 in.
October42.4 °F65.1 °F3.11 in.
November31.6 °F49.7 °F2.65 in.
December21.7 °F37.0 °F2.09 in.
Annual41 °F60.9 °F37.67 in.

Climate Data for Cornell Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
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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