Island Lake Illinois Climate Data

Monthly Average Climate Data for Island Lake Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.9 °F29.5 °F1.84 in.
February16.7 °F33.5 °F1.88 in.
March26.3 °F44.8 °F2.24 in.
April36.6 °F57.6 °F3.78 in.
May47.6 °F69.0 °F4.76 in.
June57.7 °F78.9 °F4.85 in.
July62.5 °F83.1 °F3.93 in.
August61.0 °F81.2 °F3.92 in.
September53.0 °F74.4 °F3.52 in.
October41.1 °F61.5 °F3.16 in.
November30.3 °F47.1 °F2.42 in.
December20.1 °F34.9 °F2.04 in.
Annual38.9 °F58 °F38.34 in.

Climate Data for Island Lake Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 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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