Forest City Illinois Climate Data

Monthly Average Climate Data for Forest City Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.0 °F34.2 °F2.03 in.
February20.4 °F39.0 °F1.92 in.
March30.4 °F51.1 °F2.53 in.
April40.9 °F64.0 °F3.94 in.
May52.7 °F74.6 °F4.84 in.
June62.0 °F83.6 °F4.66 in.
July65.1 °F86.6 °F4.09 in.
August62.8 °F85.2 °F3.56 in.
September54.3 °F80.0 °F3.42 in.
October42.3 °F67.1 °F3.11 in.
November31.8 °F51.8 °F2.77 in.
December22.7 °F39.4 °F2.2 in.
Annual41.9 °F63.1 °F39.07 in.

Climate Data for Forest City Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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