Last updated: June 18, 2025
In December, the average temperature in Sussex, Canada hovers around -4°C (25°F). Expect minimums plummeting to -23°C (-9°F) and maximums reaching up to 15°C (59°F). With an average humidity of 82%, you'll often feel the chill, especially during the 11 days of precipitation, totaling 114 mm (4.5 in). Prepare for a brisk and wet month!
In December in Sussex, the average temperature is -4°C (25°F), with maximums reaching up to 15°C (59°F) and minimums plummeting as low as -23°C (-9°F). Travelers should be prepared for a wide range of weather conditions, from mild to extremely cold.
In Sussex in December, the total precipitation amount is 114 mm (4.5 in) spread over 11 days.
In Sussex in December, humidity is 82%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating warm, layered clothing to shield against the damp cold.
In Sussex 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 Sussex, you can visit Hourly UV Index in Sussex.
UV Risk Categories
Weather in Sussex varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sussex, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 101 mm (4.0 inches) | 83% | low |
| February Weather | -6°C (21°F) | 104 mm (4.1 inches) | 84% | moderate |
| March Weather | -2°C (28°F) | 80 mm (3.2 inches) | 82% | moderate |
| April Weather | 4°C (40°F) | 105 mm (4.1 inches) | 80% | high |
| May Weather | 10°C (50°F) | 107 mm (4.2 inches) | 78% | very high |
| June Weather | 15°C (60°F) | 99 mm (3.9 inches) | 82% | very high |
| July Weather | 19°C (66°F) | 87 mm (3.4 inches) | 84% | very high |
| August Weather | 19°C (66°F) | 81 mm (3.2 inches) | 82% | very high |
| September Weather | 15°C (58°F) | 91 mm (3.6 inches) | 82% | high |
| October Weather | 9°C (48°F) | 93 mm (3.7 inches) | 82% | moderate |
| November Weather | 2°C (36°F) | 160 mm (6.3 inches) | 84% | moderate |
| December Weather | -4°C (25°F) | 114 mm (4.5 inches) | 82% | low |