Last updated: June 24, 2025
In Brillion, United States, the average temperature in December hovers around -3°C (27°F), with extremes ranging from a chilling -28°C (-18°F) to a mild 18°C (64°F). Expect a total precipitation of 51 mm (2.0 in) spread over 7 days, while the air maintains a high average humidity of 87%. Get ready for a wintery experience!
In December in Brillion, the average temperature is -3°C (27°F). Maximum temperatures can reach 18°C (64°F), while minimums can plunge as low as -28°C (-18°F). Be sure to dress in layers and prepare for a wide range of temperatures if you're planning to travel during this time.
In Brillion in December, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.
In Brillion in December humidity is 87%. With an average temperature of -3°C (27°F), this humidity feels like an icy blanket that wraps around you, making outdoor activities challenging as the cold air mingles with the dampness, leaving travelers feeling chilled to the bone even in short bursts outside.
In Brillion 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 Brillion, you can visit Hourly UV Index in Brillion.
UV Risk Categories
Weather in Brillion varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Brillion, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 43 mm (1.7 inches) | 89% | low |
| February Weather | -6°C (21°F) | 47 mm (1.9 inches) | 90% | moderate |
| March Weather | 1°C (34°F) | 58 mm (2.3 inches) | 87% | moderate |
| April Weather | 6°C (43°F) | 98 mm (3.9 inches) | 84% | high |
| May Weather | 14°C (57°F) | 104 mm (4.1 inches) | 77% | very high |
| June Weather | 20°C (68°F) | 103 mm (4.1 inches) | 75% | very high |
| July Weather | 23°C (73°F) | 110 mm (4.3 inches) | 74% | very high |
| August Weather | 21°C (70°F) | 101 mm (4.0 inches) | 73% | very high |
| September Weather | 17°C (63°F) | 69 mm (2.7 inches) | 78% | high |
| October Weather | 10°C (50°F) | 97 mm (3.8 inches) | 84% | moderate |
| November Weather | 2°C (36°F) | 48 mm (1.9 inches) | 89% | moderate |
| December Weather | -3°C (27°F) | 51 mm (2.0 inches) | 87% | low |