Oregon Illinois Climate Data

Monthly Average Climate Data for Oregon Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.4 °F28.8 °F1.76 in.
February15.9 °F33.1 °F1.73 in.
March26.7 °F45.8 °F2.41 in.
April37.3 °F59.5 °F3.68 in.
May49.3 °F70.7 °F4.74 in.
June59.2 °F79.8 °F5.03 in.
July62.3 °F82.6 °F4.2 in.
August60.5 °F81.1 °F3.97 in.
September52.0 °F75.1 °F3.53 in.
October40.2 °F62.2 °F2.94 in.
November29.3 °F47.1 °F2.31 in.
December18.9 °F34.4 °F2.04 in.
Annual38.7 °F58.4 °F38.34 in.

Climate Data for Oregon 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 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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