Last updated: June 18, 2025
In Saint-Hyacinthe, Canada, the average temperature in December is a chilly -5°C (23°F). Expect extremes, with minimum temperatures plunging to -28°C (-18°F) and maxing out at a mild 15°C (60°F). The month sees about 89 mm (3.5 in) of precipitation over 11 days, contributing to an average humidity of 89%. Dress warmly and be prepared for wet conditions!
In December in Saint-Hyacinthe, the average temperature is -5°C (23°F), with maximums reaching 15°C (60°F) and minimums plummeting to as low as -28°C (-18°F). This drastic variation in temperature makes it essential for travelers to pack accordingly and be prepared for both chilly and mild days.
In Saint-Hyacinthe in December, the precipitation amount is 89 mm (3.5 in) over a span of 11 days.
In Saint-Hyacinthe in December, humidity is 89%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and prompting frequent breaks to warm up indoors.
In Saint-Hyacinthe 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-Hyacinthe, you can visit Hourly UV Index in Saint-Hyacinthe.
UV Risk Categories
Weather in Saint-Hyacinthe varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Saint-Hyacinthe, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (17°F) | 86 mm (3.4 inches) | 93% | low |
| February Weather | -7°C (19°F) | 82 mm (3.2 inches) | 92% | moderate |
| March Weather | -2°C (28°F) | 85 mm (3.3 inches) | 86% | moderate |
| April Weather | 6°C (43°F) | 119 mm (4.7 inches) | 85% | very high |
| May Weather | 14°C (57°F) | 98 mm (3.8 inches) | 80% | very high |
| June Weather | 19°C (66°F) | 107 mm (4.2 inches) | 74% | very high |
| July Weather | 22°C (71°F) | 98 mm (3.9 inches) | 76% | very high |
| August Weather | 21°C (69°F) | 113 mm (4.5 inches) | 75% | very high |
| September Weather | 16°C (61°F) | 64 mm (2.5 inches) | 78% | high |
| October Weather | 10°C (49°F) | 133 mm (5.3 inches) | 86% | moderate |
| November Weather | 1°C (34°F) | 118 mm (4.6 inches) | 88% | moderate |
| December Weather | -5°C (23°F) | 89 mm (3.5 inches) | 89% | low |