Park Forest Illinois Climate Data

Monthly Average Climate Data for Park Forest Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.6 °F31.7 °F2.28 in.
February19.4 °F35.7 °F2.12 in.
March28.7 °F46.7 °F2.4 in.
April39.2 °F59.5 °F3.9 in.
May49.9 °F70.3 °F4.51 in.
June59.8 °F80.2 °F4.71 in.
July64.3 °F84.0 °F4.51 in.
August62.7 °F82.2 °F4.16 in.
September55.2 °F75.9 °F3.28 in.
October43.1 °F62.9 °F3.51 in.
November32.2 °F49.0 °F2.77 in.
December22.2 °F36.8 °F2.29 in.
Annual41.1 °F59.6 °F40.44 in.

Climate Data for Park Forest Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°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