Last updated: June 24, 2025
In Mountain City, United States, the average temperature in December hovers around 6°C (43°F). Be prepared for a range of temperatures, as it can dip to a minimum of -12°C (11°F) and soar to a maximum of 23°C (73°F). Expect 156 mm (6.2 in) of precipitation over 11 days, and with an average humidity of 88%, it's advisable to pack accordingly!
In December in Mountain City, the average temperature is 6°C (43°F). The maximum can reach 23°C (73°F), while the minimum can dip as low as -12°C (11°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.
In Mountain City in December, the precipitation amount is 156 mm (6.2 in) spread over 11 days.
In Mountain City in December, humidity is 88%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and prompting you to seek warm shelter frequently.
In Mountain City in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Mountain City for better planning.
UV Risk Categories
Weather in Mountain City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mountain City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 122 mm (4.8 inches) | 86% | moderate |
| February Weather | 7°C (45°F) | 196 mm (7.7 inches) | 86% | high |
| March Weather | 10°C (49°F) | 152 mm (6.0 inches) | 86% | very high |
| April Weather | 13°C (56°F) | 149 mm (5.9 inches) | 82% | extreme |
| May Weather | 18°C (64°F) | 155 mm (6.1 inches) | 85% | extreme |
| June Weather | 21°C (70°F) | 131 mm (5.2 inches) | 85% | extreme |
| July Weather | 23°C (73°F) | 121 mm (4.8 inches) | 83% | extreme |
| August Weather | 22°C (72°F) | 160 mm (6.3 inches) | 76% | extreme |
| September Weather | 20°C (68°F) | 142 mm (5.6 inches) | 76% | very high |
| October Weather | 15°C (60°F) | 172 mm (6.8 inches) | 80% | very high |
| November Weather | 8°C (47°F) | 101 mm (4.0 inches) | 88% | high |
| December Weather | 6°C (43°F) | 156 mm (6.2 inches) | 88% | moderate |