Round Lake Park Illinois Climate Data

Monthly Average Climate Data for Round Lake Park Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.3 °F29.5 °F1.93 in.
February17.1 °F33.1 °F1.96 in.
March26.3 °F44.2 °F2.28 in.
April36.8 °F56.9 °F3.9 in.
May47.4 °F68.3 °F4.46 in.
June57.6 °F78.2 °F4.63 in.
July62.5 °F82.5 °F3.81 in.
August61.1 °F80.8 °F3.77 in.
September53.3 °F74.0 °F3.57 in.
October41.9 °F61.1 °F3.19 in.
November30.8 °F47.0 °F2.41 in.
December20.3 °F34.8 °F2.15 in.
Annual39.1 °F57.5 °F38.06 in.

Climate Data for Round Lake Park Illinois

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