Highland Park Illinois Climate Data

Monthly Average Climate Data for Highland Park Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.2 °F31.4 °F2.1 in.
February20.9 °F35.1 °F2.0 in.
March29.6 °F44.8 °F2.21 in.
April39.5 °F56.0 °F3.84 in.
May49.8 °F67.7 °F4.62 in.
June60.0 °F77.9 °F4.26 in.
July66.4 °F82.7 °F3.74 in.
August65.9 °F81.1 °F4.04 in.
September58.0 °F74.5 °F3.59 in.
October46.0 °F62.0 °F3.46 in.
November34.4 °F48.0 °F2.61 in.
December24.2 °F36.7 °F2.21 in.
Annual42.7 °F58.2 °F38.68 in.

Climate Data for Highland Park Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
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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