Last updated: June 24, 2025
In December, the average temperature in Trenton, United States hovers around 4°C (40°F), with a considerable range from a chilly -16°C (3°F) to a mild 22°C (73°F). Expect about 71 mm (2.8 in) of precipitation over 7 days within this month, coupled with a high average humidity of 87%. 🌧️ Prepare accordingly for a blend of cold and wet weather!
In December in Trenton, the average temperature is 4°C (40°F), with a maximum that can reach 22°C (73°F) and a minimum that can dip as low as -16°C (3°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack both warm clothes and lighter layers for the varied weather.
In Trenton in December, the precipitation amount is 71 mm (2.8 in) over a span of 7 days.
In Trenton in December humidity is 87%. With an average temperature of 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.
In Trenton 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 Trenton, you can check the information here.
UV Risk Categories
Weather in Trenton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Trenton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (33°F) | 82 mm (3.2 inches) | 84% | moderate |
| February Weather | 2°C (37°F) | 87 mm (3.4 inches) | 82% | moderate |
| March Weather | 9°C (48°F) | 141 mm (5.6 inches) | 84% | high |
| April Weather | 13°C (56°F) | 144 mm (5.7 inches) | 83% | very high |
| May Weather | 20°C (68°F) | 170 mm (6.7 inches) | 80% | extreme |
| June Weather | 25°C (78°F) | 100 mm (3.9 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 92 mm (3.6 inches) | 82% | very high |
| August Weather | 25°C (77°F) | 122 mm (4.8 inches) | 82% | very high |
| September Weather | 23°C (73°F) | 59 mm (2.3 inches) | 79% | very high |
| October Weather | 15°C (60°F) | 110 mm (4.3 inches) | 79% | high |
| November Weather | 7°C (45°F) | 78 mm (3.1 inches) | 88% | moderate |
| December Weather | 4°C (40°F) | 71 mm (2.8 inches) | 87% | moderate |