Chicago Illinois Climate Data

Monthly Average Climate Data for Chicago Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January20.5 °F33.0 °F2.38 in.
February23.0 °F36.8 °F2.2 in.
March31.8 °F46.3 °F2.27 in.
April41.7 °F57.3 °F3.97 in.
May52.2 °F67.8 °F4.64 in.
June62.4 °F77.4 °F4.46 in.
July68.7 °F81.4 °F4.08 in.
August67.7 °F80.8 °F4.05 in.
September60.3 °F74.3 °F3.31 in.
October47.9 °F62.5 °F3.77 in.
November36.3 °F49.4 °F2.76 in.
December26.0 °F37.8 °F2.47 in.
Annual44.9 °F58.7 °F40.36 in.

Climate Data for Chicago Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation