Round Lake Beach Climate by Month
Round Lake Beach, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Round Lake Beach's climate in short. Afternoon highs range from 30°F (-1°C) in January to 82°F (28°C) in July, and January nights average 14°F (-10°C). It gets 37 in (935 mm) of rain a year, spread across the months.
- Warmest month
- 82°F(28°C)
- Average high, July
- Coldest nights
- 14°F(-10°C)
- Average low, January
- Rain per year
- 37 in(935 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Round Lake Beach
Best for weatherThe most comfortable weather comes in June and September, with highs around 76°F (24°C) and about 3.9 in (99 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 30°F (-1°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Round Lake Beach weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 30°F(-1°C) | 14°F(-10°C) | 1.8 in(46 mm) | 98% | 1.4 |
| FebFebruary | 34°F(1°C) | 17°F(-8°C) | 1.5 in(39 mm) | 84% | 2.4 |
| MarMarch | 45°F(7°C) | 27°F(-3°C) | 2.3 in(58 mm) | 70% | 3.6 |
| AprApril | 57°F(14°C) | 37°F(3°C) | 4.0 in(102 mm) | 64% | 4.5 |
| MayMay | 69°F(20°C) | 47°F(8°C) | 4.3 in(108 mm) | 68% | 5.1 |
| JunJuneBest | 78°F(26°C) | 56°F(13°C) | 4.2 in(107 mm) | 71% | 5.8 |
| JulJuly | 82°F(28°C) | 61°F(16°C) | 3.7 in(95 mm) | 72% | 5.9 |
| AugAugust | 80°F(27°C) | 60°F(16°C) | 4.3 in(108 mm) | 75% | 5.1 |
| SepSeptemberBest | 74°F(23°C) | 53°F(12°C) | 3.6 in(91 mm) | 70% | 4.3 |
| OctOctober | 62°F(17°C) | 41°F(5°C) | 2.8 in(70 mm) | 69% | 2.7 |
| NovNovember | 47°F(8°C) | 30°F(-1°C) | 2.3 in(59 mm) | 75% | 1.7 |
| DecDecember | 35°F(2°C) | 20°F(-7°C) | 2.0 in(52 mm) | 80% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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