Last updated: June 24, 2025
In Rupert, United States, the average temperature for December hovers around -1°C (30°F), with extremes ranging from a chilly -14°C (8°F) to a mild 15°C (60°F). Expect 38 mm (1.5 in) of precipitation over 9 days, contributing to the area's distinct average humidity of 87%. Whether you're bracing for the cold or enjoying the occasional warmth, this month brings its own challenges and surprises!
In December in Rupert, the average temperature is -1°C (30°F). Maximum temperatures can reach 15°C (60°F), while minimums can plummet to as low as -14°C (8°F). Be prepared for a wide range of temperatures during your travels.
In Rupert in December, the total precipitation amount is 38 mm (1.5 in) spread over a duration of 9 days.
In Rupert 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 Rupert in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Rupert, you can check the information here.
UV Risk Categories
Weather in Rupert varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rupert, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 41 mm (1.6 inches) | 91% | moderate |
| February Weather | 0°C (33°F) | 49 mm (1.9 inches) | 92% | moderate |
| March Weather | 5°C (41°F) | 38 mm (1.5 inches) | 85% | high |
| April Weather | 9°C (48°F) | 36 mm (1.4 inches) | 76% | very high |
| May Weather | 14°C (57°F) | 47 mm (1.8 inches) | 66% | very high |
| June Weather | 20°C (68°F) | 21 mm (0.8 inches) | 62% | extreme |
| July Weather | 25°C (77°F) | 8 mm (0.3 inches) | 53% | extreme |
| August Weather | 23°C (75°F) | 15 mm (0.6 inches) | 42% | very high |
| September Weather | 18°C (64°F) | 20 mm (0.8 inches) | 46% | very high |
| October Weather | 9°C (48°F) | 28 mm (1.1 inches) | 64% | high |
| November Weather | 4°C (39°F) | 30 mm (1.2 inches) | 83% | moderate |
| December Weather | -1°C (30°F) | 38 mm (1.5 inches) | 87% | moderate |