Waukegan Illinois Climate Data

Monthly Average Climate Data for Waukegan Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.7 °F30.8 °F2.09 in.
February19.3 °F33.9 °F2.06 in.
March28.1 °F43.4 °F2.09 in.
April38.2 °F54.1 °F3.73 in.
May48.2 °F65.1 °F4.35 in.
June58.2 °F75.1 °F4.23 in.
July64.6 °F80.4 °F3.62 in.
August64.1 °F79.2 °F3.62 in.
September56.4 °F72.7 °F3.14 in.
October44.5 °F60.9 °F3.16 in.
November33.0 °F47.7 °F2.42 in.
December22.6 °F36.0 °F2.05 in.
Annual41.2 °F56.6 °F36.56 in.

Climate Data for Waukegan Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 11 - May 20
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
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