Round Lake Beach Illinois Climate Data

Monthly Average Climate Data for Round Lake Beach Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.1 °F29.4 °F1.92 in.
February16.9 °F33.1 °F1.94 in.
March26.3 °F44.2 °F2.27 in.
April36.7 °F56.9 °F3.89 in.
May47.4 °F68.4 °F4.45 in.
June57.6 °F78.2 °F4.66 in.
July62.5 °F82.5 °F3.8 in.
August61.0 °F80.8 °F3.77 in.
September53.4 °F74.0 °F3.59 in.
October41.7 °F61.0 °F3.17 in.
November30.6 °F46.8 °F2.4 in.
December20.3 °F34.7 °F2.16 in.
Annual39 °F57.5 °F38.02 in.

Climate Data for Round Lake Beach 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