Ohio Illinois Climate Data

Monthly Average Climate Data for Ohio Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.8 °F29.1 °F1.76 in.
February16.6 °F33.7 °F1.74 in.
March26.5 °F46.1 °F2.36 in.
April37.2 °F59.6 °F3.59 in.
May49.0 °F70.8 °F4.8 in.
June58.8 °F79.6 °F4.97 in.
July62.2 °F82.6 °F4.02 in.
August60.0 °F80.8 °F3.96 in.
September51.7 °F75.2 °F3.45 in.
October40.1 °F62.6 °F2.97 in.
November29.0 °F47.4 °F2.39 in.
December18.9 °F34.6 °F1.93 in.
Annual38.6 °F58.5 °F37.94 in.

Climate Data for Ohio 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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