Somonauk Illinois Climate Data

Monthly Average Climate Data for Somonauk Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.2 °F29.9 °F1.81 in.
February17.6 °F34.3 °F1.77 in.
March27.4 °F46.6 °F2.33 in.
April38.0 °F60.0 °F3.67 in.
May49.5 °F71.3 °F4.73 in.
June59.4 °F80.6 °F4.6 in.
July63.1 °F83.7 °F3.92 in.
August60.9 °F81.7 °F3.87 in.
September52.9 °F76.2 °F3.44 in.
October41.1 °F63.3 °F3.2 in.
November30.4 °F48.2 °F2.5 in.
December20.2 °F35.4 °F2.07 in.
Annual39.6 °F59.3 °F37.91 in.

Climate Data for Somonauk 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 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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