Last updated: June 24, 2025
In December, the average temperature in Mountain City, United States hovers around 4°C (39°F), with a cool range that can dip as low as -14°C (7°F) and peak at a pleasant 20°C (67°F). Expect a bit of rain, with 115 mm (4.5 in) of precipitation spread over 12 days, contributing to an overall humidity level of 86%. Be prepared for a mix of chilly days and occasional warmth!
In December in Mountain City, the average temperature is 4°C (39°F). The maximum can reach 20°C (67°F) and the minimum can be as low as -14°C (7°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack appropriate layers for both mild and chilly conditions.
In Mountain City in December, the total precipitation amount is 115 mm (4.5 in) over a span of 12 days.
In Mountain City in December humidity is 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.
In Mountain City 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 Mountain City, you can check the information here.
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 | 1°C (35°F) | 95 mm (3.7 inches) | 87% | moderate |
| February Weather | 5°C (41°F) | 142 mm (5.6 inches) | 87% | high |
| March Weather | 7°C (45°F) | 123 mm (4.8 inches) | 86% | very high |
| April Weather | 11°C (52°F) | 144 mm (5.7 inches) | 84% | extreme |
| May Weather | 16°C (61°F) | 132 mm (5.2 inches) | 83% | extreme |
| June Weather | 19°C (67°F) | 130 mm (5.1 inches) | 83% | extreme |
| July Weather | 22°C (71°F) | 95 mm (3.8 inches) | 79% | extreme |
| August Weather | 21°C (69°F) | 119 mm (4.7 inches) | 66% | extreme |
| September Weather | 18°C (65°F) | 111 mm (4.4 inches) | 68% | very high |
| October Weather | 13°C (57°F) | 128 mm (5.0 inches) | 78% | very high |
| November Weather | 6°C (43°F) | 79 mm (3.1 inches) | 89% | high |
| December Weather | 4°C (39°F) | 115 mm (4.5 inches) | 86% | moderate |