Last updated: June 24, 2025
In Altamont, United States, the average temperature in December hovers around 3°C (38°F). However, temperatures can range significantly, with minimums plummeting to -19°C (-3°F) and highs climbing up to 20°C (67°F). Expect around 75 mm (2.9 in) of precipitation spread over 8 days, and prepare for a rather humid environment, as the average humidity stands at a notable 87%.
In December in Altamont, the average temperature is 3°C (38°F), with maximums reaching 20°C (67°F) and minimums dropping as low as -19°C (-3°F). It's advisable to pack for a wide range of temperatures to ensure a comfortable travel experience.
In Altamont in December, the precipitation amount is 75 mm (2.9 in) over a span of 8 days.
In Altamont in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Altamont 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 Altamont, you can check the information here.
UV Risk Categories
Weather in Altamont varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Altamont, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 82 mm (3.2 inches) | 84% | moderate |
| February Weather | 2°C (35°F) | 86 mm (3.4 inches) | 82% | moderate |
| March Weather | 8°C (46°F) | 134 mm (5.3 inches) | 84% | high |
| April Weather | 13°C (55°F) | 126 mm (5.0 inches) | 83% | very high |
| May Weather | 20°C (67°F) | 153 mm (6.0 inches) | 80% | extreme |
| June Weather | 25°C (77°F) | 107 mm (4.2 inches) | 83% | extreme |
| July Weather | 26°C (79°F) | 99 mm (3.9 inches) | 82% | very high |
| August Weather | 24°C (76°F) | 105 mm (4.2 inches) | 82% | very high |
| September Weather | 22°C (72°F) | 65 mm (2.6 inches) | 79% | very high |
| October Weather | 15°C (59°F) | 116 mm (4.5 inches) | 79% | high |
| November Weather | 6°C (43°F) | 88 mm (3.5 inches) | 88% | moderate |
| December Weather | 3°C (38°F) | 75 mm (2.9 inches) | 87% | moderate |