Last updated: June 24, 2025
In December, the average temperature in Round Lake Heights, United States hovers around 0°C (33°F), with extremes ranging from a chilling -19°C (-2°F) to a mild 17°C (63°F). Expect about 58 mm (2.3 in) of precipitation spread over 8 days, and prepare for relatively high humidity at 81%.
In December in Round Lake Heights, the average temperature is 0°C (33°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -19°C (-2°F). Travelers should prepare for a wide range of temperatures and pack accordingly to enjoy their visit.
In Round Lake Heights in December, the precipitation amount is 58 mm (2.3 in) over a span of 8 days.
In Round Lake Heights in December, humidity is 81%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill enveloping you, making travel uncomfortable and the air heavy, leaving you craving warmth and dry conditions.
In Round Lake Heights in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Round Lake Heights, you can visit Hourly UV Index in Round Lake Heights.
UV Risk Categories
Weather in Round Lake Heights varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Round Lake Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 67 mm (2.7 inches) | 85% | low |
| February Weather | -3°C (27°F) | 65 mm (2.6 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 70 mm (2.8 inches) | 85% | high |
| April Weather | 6°C (44°F) | 113 mm (4.5 inches) | 85% | very high |
| May Weather | 12°C (54°F) | 156 mm (6.1 inches) | 78% | very high |
| June Weather | 18°C (66°F) | 100 mm (3.9 inches) | 80% | very high |
| July Weather | 22°C (73°F) | 74 mm (2.9 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 72 mm (2.8 inches) | 76% | very high |
| September Weather | 19°C (67°F) | 84 mm (3.3 inches) | 79% | very high |
| October Weather | 12°C (54°F) | 130 mm (5.1 inches) | 83% | moderate |
| November Weather | 4°C (39°F) | 56 mm (2.2 inches) | 88% | moderate |
| December Weather | 0°C (33°F) | 58 mm (2.3 inches) | 81% | low |