Prospect Heights Illinois Climate Data

Monthly Average Climate Data for Prospect Heights Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.2 °F31.1 °F2.03 in.
February18.9 °F35.1 °F1.95 in.
March28.3 °F45.9 °F2.26 in.
April38.4 °F57.8 °F3.75 in.
May49.3 °F69.2 °F4.52 in.
June59.3 °F79.4 °F4.39 in.
July64.7 °F83.7 °F3.64 in.
August63.3 °F81.8 °F4.01 in.
September55.2 °F75.1 °F3.27 in.
October43.3 °F62.2 °F3.22 in.
November32.0 °F48.0 °F2.41 in.
December22.2 °F36.4 °F2.13 in.
Annual40.9 °F58.8 °F37.58 in.

Climate Data for Prospect Heights 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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation