Last updated: June 24, 2025
In December, the average temperature in Saint Clair, United States sits at a brisk 0°C (33°F). Expect a range where the minimum can plunge to -17°C (1°F) and the maximum may reach up to 16°C (60°F). During this time, precipitation averages around 63 mm (2.5 in) over 10 days, with the air humidity hovering at a high 86%. Whether you're bundling up to brave the cold or preparing for occasional rain, be ready for a true winter experience!
In December in Saint Clair, the average temperature is 0°C (33°F). Maximums can reach 16°C (60°F), while minimums can drop to as low as -17°C (1°F). Be prepared for a chilly climate and dress warmly if you're planning to travel during this time.
In Saint Clair in December, the precipitation amount is 63 mm (2.5 in) over a span of 10 days.
In Saint Clair in December humidity is 86%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that permeates your clothes, making traveling uncomfortable and necessitating warm, layered clothing to stay dry and cozy.
In Saint Clair 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 Saint Clair, you can visit Hourly UV Index in Saint Clair.
UV Risk Categories
Weather in Saint Clair varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Saint Clair, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 70 mm (2.8 inches) | 88% | low |
| February Weather | -2°C (29°F) | 73 mm (2.9 inches) | 87% | moderate |
| March Weather | 2°C (36°F) | 70 mm (2.7 inches) | 85% | moderate |
| April Weather | 7°C (46°F) | 97 mm (3.8 inches) | 86% | very high |
| May Weather | 14°C (58°F) | 105 mm (4.1 inches) | 80% | very high |
| June Weather | 20°C (69°F) | 93 mm (3.6 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 82 mm (3.2 inches) | 80% | very high |
| August Weather | 22°C (73°F) | 80 mm (3.2 inches) | 80% | very high |
| September Weather | 19°C (66°F) | 77 mm (3.0 inches) | 80% | high |
| October Weather | 12°C (55°F) | 113 mm (4.5 inches) | 84% | moderate |
| November Weather | 4°C (40°F) | 82 mm (3.2 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 63 mm (2.5 inches) | 86% | low |