Last updated: June 18, 2025
In Greater Sudbury, Canada, the average temperature in December hovers around -8°C (18°F), with the mercury dipping as low as -33°C (-27°F) and occasionally rising to a maximum of 10°C (51°F). This month sees about 65 mm (2.5 in) of precipitation spread over 13 days, contributing to a notably high average humidity of 93%.
In December in Greater Sudbury, the average temperature is -8°C (18°F). The maximum can reach 10°C (51°F), while the minimum can drop as low as -33°C (-27°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both cold and moderate weather.
In Greater Sudbury in December, the total precipitation amount is 65 mm (2.5 in) over a span of 13 days.
In Greater Sudbury in December humidity is 93%. With an average temperature of -8°C (18°F), this humidity feels like a bone-chilling dampness that seeps into your clothes, making even the briefest moments outside feel uncomfortable and heavy, as if you're trudging through a misty, cold cloud that wraps around you.
In Greater Sudbury 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 Greater Sudbury, you can visit Hourly UV Index in Greater Sudbury.
UV Risk Categories
Weather in Greater Sudbury varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Greater Sudbury, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -11°C (13°F) | 45 mm (1.8 inches) | 96% | low |
| February Weather | -10°C (14°F) | 60 mm (2.4 inches) | 95% | moderate |
| March Weather | -5°C (24°F) | 51 mm (2.0 inches) | 89% | moderate |
| April Weather | 3°C (38°F) | 83 mm (3.3 inches) | 87% | high |
| May Weather | 11°C (53°F) | 82 mm (3.2 inches) | 73% | very high |
| June Weather | 17°C (62°F) | 96 mm (3.8 inches) | 69% | very high |
| July Weather | 20°C (68°F) | 94 mm (3.7 inches) | 66% | very high |
| August Weather | 18°C (65°F) | 96 mm (3.8 inches) | 71% | very high |
| September Weather | 14°C (57°F) | 90 mm (3.6 inches) | 76% | high |
| October Weather | 7°C (45°F) | 124 mm (4.9 inches) | 85% | moderate |
| November Weather | -2°C (29°F) | 81 mm (3.2 inches) | 89% | moderate |
| December Weather | -8°C (18°F) | 65 mm (2.5 inches) | 93% | low |