Vernon Hills Illinois Climate Data

Monthly Average Climate Data for Vernon Hills Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.6 °F30.6 °F1.96 in.
February18.4 °F34.3 °F1.98 in.
March27.6 °F45.2 °F2.31 in.
April37.9 °F57.5 °F3.84 in.
May48.6 °F68.6 °F4.46 in.
June58.6 °F78.9 °F4.48 in.
July64.1 °F83.3 °F3.83 in.
August62.8 °F81.4 °F3.87 in.
September54.9 °F74.7 °F3.41 in.
October43.1 °F61.9 °F3.27 in.
November31.7 °F47.8 °F2.41 in.
December21.7 °F36.0 °F2.1 in.
Annual40.4 °F58.4 °F37.92 in.

Climate Data for Vernon Hills Illinois

Average First Frost DateOct. 11 - Oct. 20
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