Last updated: June 24, 2025
In December, the average temperature in Denville, United States hovers around 2°C (35°F). Expect chilly nights with minimums plunging to -15°C (5°F), while days can warm up to a pleasant 17°C (63°F). This month sees about 112 mm (4.4 in) of precipitation across 11 days, contributing to a notably high average humidity of 80%. Be prepared for a mix of cool weather and occasional rain!
In December in Denville, the average temperature is 2°C (35°F). Maximum temperatures can reach 17°C (63°F), while the minimum can drop as low as -15°C (5°F). Be prepared for a wide range of temperatures when traveling to Denville this month.
In Denville in December, the precipitation amount is 112 mm (4.4 in) that occurs over the course of 11 days.
In Denville 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 Denville 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 Denville, you can visit Hourly UV Index in Denville.
UV Risk Categories
Weather in Denville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Denville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 72 mm (2.8 inches) | 84% | moderate |
| February Weather | 1°C (34°F) | 101 mm (4.0 inches) | 82% | moderate |
| March Weather | 4°C (39°F) | 97 mm (3.8 inches) | 81% | high |
| April Weather | 10°C (50°F) | 117 mm (4.6 inches) | 78% | very high |
| May Weather | 16°C (60°F) | 137 mm (5.4 inches) | 69% | very high |
| June Weather | 21°C (70°F) | 102 mm (4.0 inches) | 69% | very high |
| July Weather | 24°C (76°F) | 142 mm (5.6 inches) | 62% | very high |
| August Weather | 23°C (74°F) | 136 mm (5.4 inches) | 65% | very high |
| September Weather | 19°C (67°F) | 111 mm (4.4 inches) | 68% | very high |
| October Weather | 14°C (57°F) | 143 mm (5.6 inches) | 74% | high |
| November Weather | 6°C (43°F) | 90 mm (3.5 inches) | 82% | moderate |
| December Weather | 2°C (35°F) | 112 mm (4.4 inches) | 80% | low |