Sterling Illinois Climate Data

Monthly Average Climate Data for Sterling Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.9 °F29.3 °F1.71 in.
February16.7 °F33.8 °F1.72 in.
March27.2 °F46.4 °F2.39 in.
April37.9 °F60.1 °F3.83 in.
May49.8 °F71.5 °F4.92 in.
June59.6 °F80.6 °F5.41 in.
July62.8 °F83.5 °F4.28 in.
August60.7 °F81.8 °F4.28 in.
September52.3 °F76.0 °F3.76 in.
October40.7 °F63.0 °F2.8 in.
November29.5 °F47.6 °F2.29 in.
December19.4 °F35.0 °F1.94 in.
Annual39.1 °F59.1 °F39.33 in.

Climate Data for Sterling 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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