Last updated: June 24, 2025
In December, the average temperature in Fairmont, United States hovers around -4°C (26°F). While the minimum can drop as low as -24°C (-11°F), temperatures can also soar to a maximum of 19°C (66°F). Expect 42 mm (1.6 in) of precipitation over 5 days, with an average humidity level of 83%, contributing to a crisp and moist atmosphere.
In December in Fairmont, the average temperature is -4°C (26°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -24°C (-11°F). Travelers should be prepared for a wide range of temperatures, from chilly days to surprisingly warm spells.
In Fairmont in December, the precipitation amount is 42 mm (1.6 in) over a period of 5 days.
In Fairmont in December, humidity is 83%. With an average temperature of -4°C (26°F), this humidity feels like a chilling blanket that clings to your skin, making outdoor activities uncomfortable and forcing travelers to bundle up tightly, even as the cold penetrates through layers of clothing.
In Fairmont 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 Fairmont, you can check the information here.
UV Risk Categories
Weather in Fairmont varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Fairmont, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 34 mm (1.4 inches) | 82% | moderate |
| February Weather | -8°C (17°F) | 38 mm (1.5 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 73 mm (2.9 inches) | 80% | moderate |
| April Weather | 7°C (45°F) | 93 mm (3.7 inches) | 81% | very high |
| May Weather | 15°C (60°F) | 141 mm (5.6 inches) | 74% | very high |
| June Weather | 22°C (73°F) | 117 mm (4.6 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 114 mm (4.5 inches) | 80% | very high |
| August Weather | 22°C (71°F) | 110 mm (4.3 inches) | 77% | very high |
| September Weather | 18°C (66°F) | 121 mm (4.8 inches) | 75% | very high |
| October Weather | 9°C (49°F) | 93 mm (3.7 inches) | 80% | moderate |
| November Weather | 2°C (35°F) | 34 mm (1.3 inches) | 87% | moderate |
| December Weather | -4°C (26°F) | 42 mm (1.6 inches) | 83% | moderate |