Herscher Illinois Climate Data

Monthly Average Climate Data for Herscher Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.2 °F32.1 °F2.13 in.
February19.5 °F36.7 °F1.86 in.
March28.9 °F48.7 °F2.43 in.
April39.2 °F61.6 °F3.69 in.
May50.7 °F72.6 °F4.53 in.
June60.5 °F81.7 °F4.63 in.
July63.9 °F84.5 °F4.36 in.
August61.7 °F82.9 °F3.77 in.
September53.4 °F77.8 °F3.19 in.
October42.1 °F64.8 °F3.23 in.
November31.6 °F50.1 °F2.6 in.
December21.9 °F37.4 °F2.1 in.
Annual40.8 °F60.9 °F38.52 in.

Climate Data for Herscher 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 5b : -15°F to -10°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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