Round Lake Beach, IL climate
Round Lake Beach has cold, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 15°, and about 43 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Round Lake Beach feels like
Winter
Spring
Summer
Fall
Round Lake Beach weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 30° | 15° | 1.9" | 15.7" | 12 | 23 | 12° – 34° |
| February | 34° | 18° | 1.7" | 8.0" | 9 | 15 | 13° – 37° |
| March | 45° | 27° | 2.3" | 5.8" | 11 | 7 | 28° – 50° |
| April | 57° | 36° | 3.8" | 1.5" | 12 | 1 | 39° – 53° |
| May | 69° | 47° | 4.2" | 0 | 13 | 0 | 52° – 64° |
| June | 78° | 57° | 4.5" | 0 | 10 | 0 | 64° – 73° |
| July | 83° | 62° | 3.6" | 0 | 10 | 0 | 67° – 79° |
| August | 81° | 61° | 3.7" | 0 | 9 | 0 | 65° – 76° |
| September | 74° | 53° | 3.5" | 0 | 9 | 0 | 58° – 68° |
| October | 61° | 42° | 3.2" | 0.1" | 10 | 0 | 47° – 57° |
| November | 47° | 31° | 2.4" | 3.1" | 11 | 3 | 31° – 48° |
| December | 35° | 21° | 2.0" | 9.2" | 11 | 13 | 15° – 38° |
| Year | 58° | 39° | 36.7" | 43.4" | 126 | 61 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Round Lake Beach
Round Lake Beach gets 37 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 126 days a year. Snow covers the ground about 61 days of the year.
About 180 frost-free days a year
In half of years the last 32° night comes by April 24 and the first one by October 23. That leaves about 180 frost-free days for gardens, longer than 53% of U.S. towns.
Heating and cooling a home in Round Lake Beach
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Round Lake Beach, 90% of that work is heating and 10% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Round Lake Beach and its neighbors
Round Lake Beach borders 10 towns with climate data. January nights across them vary by 0.6°. Long Lake has both the coldest January nights (15°) and the hottest July afternoons (83°). Round Lake Beach’s January low is 15° and its July high 83°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Round Lake Beach compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Round Lake Beach averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.6°). The shift is smaller than in 59% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Round Lake Beach’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 13° to 37°. June is the most reliable, staying within 9°.
Common questions about Round Lake Beach’s climate
What is the coldest month in Round Lake Beach?
January, with a typical high of 30° and a low of 15°.
What is the hottest month in Round Lake Beach?
July, with a typical high of 83° and a low of 62°. About 10 days a year reach 90°.
How much snow does Round Lake Beach get?
About 43 inches in a normal winter, most of it in January.
When is the first frost in Round Lake Beach?
In half of years the first 32° night comes by October 23, and the last spring frost by April 24.
What is the rainiest month in Round Lake Beach?
June, with 4.5 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Round Lake Beach itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Lake Villa 2ne, IL (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.