Grant Park Illinois Climate Data

Monthly Average Climate Data for Grant Park Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.5 °F31.9 °F2.25 in.
February19.3 °F36.2 °F1.96 in.
March28.6 °F47.4 °F2.36 in.
April38.8 °F60.3 °F3.69 in.
May50.0 °F71.2 °F4.38 in.
June59.8 °F80.6 °F4.73 in.
July63.5 °F83.7 °F4.58 in.
August61.6 °F82.2 °F4.09 in.
September53.5 °F76.7 °F3.43 in.
October42.1 °F64.0 °F3.41 in.
November31.9 °F49.3 °F2.7 in.
December22.2 °F37.0 °F2.16 in.
Annual40.7 °F60 °F39.74 in.

Climate Data for Grant Park 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 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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