Sycamore Illinois Climate Data

Monthly Average Climate Data for Sycamore Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.2 °F28.9 °F1.74 in.
February16.5 °F33.2 °F1.74 in.
March26.5 °F45.3 °F2.27 in.
April37.0 °F58.7 °F3.54 in.
May48.6 °F70.2 °F4.89 in.
June58.6 °F79.8 °F4.64 in.
July62.5 °F82.9 °F3.89 in.
August60.4 °F81.1 °F4.03 in.
September52.1 °F75.1 °F3.43 in.
October40.4 °F62.3 °F3.01 in.
November29.7 °F47.1 °F2.46 in.
December19.2 °F34.3 °F2.01 in.
Annual38.7 °F58.2 °F37.65 in.

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 : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation