Last updated: June 24, 2025
In Mount Arlington, United States, the average temperature in December hovers around 2°C (35°F). Be prepared for chilly days, as the temperature can plummet to a minimum of -16°C (4°F) and may rise to a maximum of 17°C (62°F). This month also sees 107 mm (4.2 in) of precipitation spread over 11 days, contributing to an average humidity level of 80%.
In December in Mount Arlington, the average temperature is 2°C (35°F). Maximums can reach 17°C (62°F), while minimums can drop as low as -16°C (4°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.
In Mount Arlington in December, the precipitation amount is 107 mm (4.2 in) spread over a period of 11 days.
In Mount Arlington in December humidity is 80%. With an average temperature of 2°C (35°F), this humidity feels like a heavy, damp chill that clings to your skin, making outdoor excursions uncomfortable and your clothes feel soggy, while constantly reminding you to seek shelter indoors to escape the oppressive moisture in the air.
In Mount Arlington in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Mount Arlington, you can visit Hourly UV Index in Mount Arlington.
UV Risk Categories
Weather in Mount Arlington varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mount Arlington, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 70 mm (2.8 inches) | 84% | moderate |
| February Weather | 1°C (34°F) | 100 mm (3.9 inches) | 82% | moderate |
| March Weather | 4°C (39°F) | 95 mm (3.7 inches) | 81% | high |
| April Weather | 10°C (50°F) | 112 mm (4.4 inches) | 78% | very high |
| May Weather | 16°C (60°F) | 135 mm (5.3 inches) | 69% | very high |
| June Weather | 21°C (69°F) | 94 mm (3.7 inches) | 69% | very high |
| July Weather | 24°C (76°F) | 130 mm (5.1 inches) | 62% | very high |
| August Weather | 23°C (73°F) | 127 mm (5.0 inches) | 65% | very high |
| September Weather | 19°C (67°F) | 106 mm (4.2 inches) | 68% | very high |
| October Weather | 14°C (57°F) | 144 mm (5.7 inches) | 74% | high |
| November Weather | 6°C (43°F) | 88 mm (3.5 inches) | 82% | moderate |
| December Weather | 2°C (35°F) | 107 mm (4.2 inches) | 80% | low |