Last updated: June 24, 2025
In Mill City, United States, the average temperature in December hovers around 3°C (38°F). During this time, temperatures can dip as low as -8°C (18°F) or soar up to 17°C (63°F). Expect considerable precipitation with about 275 mm (10.8 in) over 21 days, and embrace the high humidity at an average of 87%. Stay prepared for a true taste of the season!
In December in Mill City, the average temperature is 3°C (38°F), with maximums reaching 17°C (63°F) and minimums dipping as low as -8°C (18°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and mild conditions.
In Mill City in December, the precipitation amount is 275 mm (10.8 in) during a span of 21 days.
In Mill City in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Mill City 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 Mill City, you can visit Hourly UV Index in Mill City.
UV Risk Categories
Weather in Mill City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mill City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 230 mm (9.0 inches) | 85% | low |
| February Weather | 3°C (37°F) | 290 mm (11.4 inches) | 84% | moderate |
| March Weather | 5°C (41°F) | 198 mm (7.8 inches) | 85% | high |
| April Weather | 8°C (47°F) | 193 mm (7.6 inches) | 83% | high |
| May Weather | 12°C (54°F) | 95 mm (3.7 inches) | 83% | very high |
| June Weather | 15°C (60°F) | 81 mm (3.2 inches) | 83% | very high |
| July Weather | 19°C (67°F) | 7 mm (0.3 inches) | 82% | very high |
| August Weather | 20°C (68°F) | 10 mm (0.4 inches) | 74% | very high |
| September Weather | 16°C (60°F) | 117 mm (4.6 inches) | 71% | very high |
| October Weather | 10°C (50°F) | 185 mm (7.3 inches) | 81% | moderate |
| November Weather | 6°C (43°F) | 230 mm (9.1 inches) | 87% | moderate |
| December Weather | 3°C (38°F) | 275 mm (10.8 inches) | 87% | low |