Last updated: June 18, 2025
In December, the average temperature in St. George, Canada hovers around -1°C (30°F). Expect minimums to plummet to -26°C (-15°F), while highs can reach a surprisingly mild 16°C (61°F). Rain is also in the forecast, with a total precipitation of 70 mm (2.8 in) spread over 11 days. With an average humidity of 87%, you might want to bundle up and prepare for damp conditions!
In December in St. George, the average temperature is -1°C (30°F), with a maximum that can reach 16°C (61°F) and a minimum that can dip as low as -26°C (-15°F). It's essential to pack warm clothing and prepare for significant temperature fluctuations while traveling to this destination.
In St. George in December, the precipitation amount is 70 mm (2.8 in) distributed over 11 days.
In St. George in December, humidity is 87%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through layers of clothing, making travel uncomfortable as the dampness clings to your skin, intensifying the cold and causing every gust of wind to feel even more frigid.
In St. George 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 St. George, you can visit Hourly UV Index in St. George.
UV Risk Categories
Weather in St. George varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in St. George, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 70 mm (2.7 inches) | 90% | low |
| February Weather | -4°C (26°F) | 74 mm (2.9 inches) | 90% | moderate |
| March Weather | 1°C (33°F) | 65 mm (2.6 inches) | 87% | moderate |
| April Weather | 6°C (44°F) | 98 mm (3.9 inches) | 87% | very high |
| May Weather | 14°C (57°F) | 97 mm (3.8 inches) | 82% | very high |
| June Weather | 19°C (67°F) | 103 mm (4.1 inches) | 81% | very high |
| July Weather | 22°C (72°F) | 82 mm (3.2 inches) | 79% | very high |
| August Weather | 21°C (70°F) | 90 mm (3.5 inches) | 80% | very high |
| September Weather | 17°C (63°F) | 71 mm (2.8 inches) | 81% | high |
| October Weather | 11°C (52°F) | 100 mm (3.9 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 75 mm (3.0 inches) | 88% | moderate |
| December Weather | -1°C (30°F) | 70 mm (2.8 inches) | 87% | low |