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Round Lake Beach, Illinois, United States has a mild continental climate, with four distinct seasons. Summers in Round Lake Beach can be hot and humid, with temperatures ranging from 70°F (21°C) to the mid-90s (32°C). Spring and autumn tend to be mild, with temperatures ranging from the mid-50s (12°C) to the low-80s (27°C). Winters are cold, with temperatures ranging from the mid-20s (-4°C) to the mid-40s (7°C). Snowfall is common in the winter months, with an average of 25 inches (64 cm) of snow per year.
As of 2020, the city population is 287012.
This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Round Lake Beach, Illinois.