Irwin Illinois Climate Data

Monthly Average Climate Data for Irwin Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.1 °F32.1 °F2.08 in.
February19.3 °F36.6 °F1.84 in.
March28.7 °F48.6 °F2.33 in.
April39.0 °F61.4 °F3.63 in.
May50.4 °F72.5 °F4.51 in.
June60.3 °F81.6 °F4.64 in.
July63.7 °F84.5 °F4.5 in.
August61.6 °F83.0 °F3.85 in.
September53.4 °F77.8 °F3.13 in.
October42.0 °F64.8 °F3.28 in.
November31.5 °F50.1 °F2.54 in.
December21.8 °F37.4 °F2.06 in.
Annual40.7 °F60.9 °F38.39 in.

Climate Data for Irwin Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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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