Round Lake Heights Illinois Climate Data

Monthly Average Climate Data for Round Lake Heights Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.9 °F29.2 °F1.91 in.
February16.7 °F33.0 °F1.93 in.
March26.1 °F44.2 °F2.26 in.
April36.5 °F56.9 °F3.88 in.
May47.3 °F68.4 °F4.46 in.
June57.4 °F78.2 °F4.69 in.
July62.4 °F82.5 °F3.8 in.
August60.9 °F80.8 °F3.78 in.
September53.1 °F74.0 °F3.6 in.
October41.5 °F61.0 °F3.17 in.
November30.5 °F46.8 °F2.4 in.
December20.2 °F34.6 °F2.15 in.
Annual38.9 °F57.5 °F38.03 in.

Climate Data for Round Lake Heights 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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