Sycamore Illinois Climate Data

Monthly Average Climate Data for Sycamore Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.4 °C-1.7 °C44.2 mm
February-8.6 °C0.7 °C44.2 mm
March-3.1 °C7.4 °C57.66 mm
April2.8 °C14.8 °C89.92 mm
May9.2 °C21.2 °C124.21 mm
June14.8 °C26.6 °C117.86 mm
July16.9 °C28.3 °C98.81 mm
August15.8 °C27.3 °C102.36 mm
September11.2 °C23.9 °C87.12 mm
October4.7 °C16.8 °C76.45 mm
November-1.3 °C8.4 °C62.48 mm
December-7.1 °C1.3 °C51.05 mm
Annual3.7 °C14.6 °C956.32 mm

Climate Data for Sycamore 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