Forsyth Illinois Climate Data

Monthly Average Climate Data for Forsyth Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.6 °F34.8 °F2.29 in.
February21.1 °F39.6 °F2.03 in.
March30.4 °F50.8 °F2.74 in.
April41.6 °F64.3 °F4.12 in.
May53.1 °F74.2 °F4.57 in.
June61.6 °F83.3 °F4.64 in.
July64.7 °F86.0 °F3.82 in.
August62.9 °F84.2 °F3.28 in.
September54.5 °F79.3 °F3.13 in.
October42.7 °F66.6 °F3.31 in.
November32.1 °F51.7 °F3.06 in.
December24.2 °F39.6 °F2.4 in.
Annual42.3 °F62.9 °F39.39 in.

Climate Data for Forsyth 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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