Last updated: June 18, 2025
The average temperature in Casselman, Canada during December hovers around -5°C (24°F), with potential extremes ranging from a chilling -29°C (-20°F) to a milder 15°C (60°F). Expect precipitation of approximately 84 mm (3.3 in) over 12 days, creating a lush atmosphere despite the cold. Be prepared for high humidity levels, averaging around 89%—perfect for winter wonderland vibes!
In December in Casselman, the average temperature is -5°C (24°F). Maximums can reach 15°C (60°F) and minimums can be as low as -29°C (-20°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and mild conditions.
In Casselman in December, the precipitation amount is 84 mm (3.3 in) over a span of 12 days.
In Casselman in December humidity is 89%. With an average temperature of -5°C (24°F), this humidity feels like an uncomfortable chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm while battling the dampness in the air.
In Casselman 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 Casselman, you can visit Hourly UV Index in Casselman.
UV Risk Categories
Weather in Casselman varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Casselman, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 81 mm (3.2 inches) | 93% | low |
| February Weather | -7°C (20°F) | 83 mm (3.3 inches) | 93% | moderate |
| March Weather | -2°C (29°F) | 90 mm (3.5 inches) | 86% | moderate |
| April Weather | 6°C (43°F) | 118 mm (4.6 inches) | 82% | very high |
| May Weather | 14°C (57°F) | 113 mm (4.4 inches) | 75% | very high |
| June Weather | 19°C (66°F) | 101 mm (4.0 inches) | 68% | very high |
| July Weather | 22°C (72°F) | 118 mm (4.6 inches) | 69% | very high |
| August Weather | 21°C (69°F) | 97 mm (3.8 inches) | 67% | very high |
| September Weather | 16°C (61°F) | 75 mm (2.9 inches) | 72% | high |
| October Weather | 10°C (50°F) | 134 mm (5.3 inches) | 83% | moderate |
| November Weather | 1°C (34°F) | 101 mm (4.0 inches) | 88% | moderate |
| December Weather | -5°C (24°F) | 84 mm (3.3 inches) | 89% | low |