Forrest Illinois Climate Data

Monthly Average Climate Data for Forrest Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.2 °F32.2 °F2.09 in.
February19.4 °F36.9 °F1.78 in.
March28.9 °F49.0 °F2.54 in.
April39.3 °F62.6 °F3.62 in.
May51.1 °F73.6 °F4.34 in.
June60.6 °F82.1 °F4.35 in.
July63.8 °F84.8 °F4.21 in.
August61.5 °F83.1 °F3.54 in.
September53.3 °F78.2 °F3.07 in.
October42.1 °F65.5 °F3.17 in.
November31.5 °F50.0 °F2.61 in.
December21.8 °F37.3 °F2.03 in.
Annual40.8 °F61.3 °F37.35 in.

Climate Data for Forrest Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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