Last updated: June 18, 2025
The average temperature in Ancaster, Canada during December hovers around -1°C (31°F), but it can swing dramatically with minimums reaching -25°C (-13°F) and maximums soaring to 16°C (61°F). Expect precipitation to total about 73 mm (2.9 in) spread over 11 days, accompanied by a high average humidity of 87%. Stay prepared for a chilly yet dynamic climate!
In December in Ancaster, the average temperature is -1°C (31°F). Maximums can reach 16°C (61°F), while minimums can drop to as low as -25°C (-13°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Ancaster in December, the precipitation amount is 73 mm (2.9 in), spread over 11 days.
In Ancaster in December humidity is 87%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through your clothes, making traveling incredibly uncomfortable as it adds a layer of dampness to the already cold air, leaving you shivering and wishing for warmth.
In Ancaster 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 Ancaster, you can visit Hourly UV Index in Ancaster.
UV Risk Categories
Weather in Ancaster varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Ancaster, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 69 mm (2.7 inches) | 90% | low |
| February Weather | -3°C (26°F) | 73 mm (2.9 inches) | 90% | moderate |
| March Weather | 1°C (34°F) | 64 mm (2.5 inches) | 87% | moderate |
| April Weather | 7°C (44°F) | 103 mm (4.1 inches) | 87% | very high |
| May Weather | 14°C (57°F) | 96 mm (3.8 inches) | 82% | very high |
| June Weather | 19°C (67°F) | 98 mm (3.9 inches) | 81% | very high |
| July Weather | 22°C (73°F) | 93 mm (3.6 inches) | 79% | very high |
| August Weather | 21°C (71°F) | 89 mm (3.5 inches) | 80% | very high |
| September Weather | 18°C (64°F) | 69 mm (2.7 inches) | 81% | high |
| October Weather | 11°C (53°F) | 101 mm (4.0 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 75 mm (2.9 inches) | 88% | moderate |
| December Weather | -1°C (31°F) | 73 mm (2.9 inches) | 87% | low |