Sterling Illinois Climate Data

Monthly Average Climate Data for Sterling Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.6 °C-1.5 °C43.43 mm
February-8.5 °C1 °C43.69 mm
March-2.7 °C8 °C60.71 mm
April3.3 °C15.6 °C97.28 mm
May9.9 °C21.9 °C124.97 mm
June15.3 °C27 °C137.41 mm
July17.1 °C28.6 °C108.71 mm
August15.9 °C27.7 °C108.71 mm
September11.3 °C24.4 °C95.5 mm
October4.8 °C17.2 °C71.12 mm
November-1.4 °C8.7 °C58.17 mm
December-7 °C1.7 °C49.28 mm
Annual4 °C15 °C998.98 mm

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 : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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