December Weather in Trenton, United States

Last updated: June 24, 2025

In Trenton, United States, the average temperature in December hovers around -4°C (25°F). Expect chilly conditions with minimums dipping to -19°C (-2°F), while the mercury can rise to a maximum of 11°C (52°F). Prepare for some precipitation, with around 46 mm (1.8 in) expected over 10 days, and don’t forget to bundle up, as the average humidity reaches a brisk 88%!

December Temperature in Trenton

In December in Trenton, the average temperature is -4°C (25°F), with maximums reaching 11°C (52°F) and minimums dipping as low as -19°C (-2°F). Travelers should be prepared for a cold climate and pack accordingly for fluctuating temperatures.

December Weather in Trenton: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Trenton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trenton, December typically has an average temperature of -4°C (25°F), with highs reaching up to 11°C (52°F) and lows dropping to around -19°C (-2°F).

Data source: Temperature data for Trenton generated using information from the Copernicus Climate Change Service.

December Precipitation in Trenton

In Trenton in December, the precipitation amount is 46 mm (1.8 in) over the course of 10 days.

December Precipitation Trends in Trenton

The chart displays monthly precipitation patterns in Trenton, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Trenton, December typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Trenton

In Trenton in December, humidity is 88%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making outdoor excursions brisk and invigorating, yet challenging as you navigate the frosty air.

December Average Humidity in Trenton

This chart illustrates the average monthly humidity levels in Trenton, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Trenton is approximately 88%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Trenton

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.

Maximum UV Index Levels in Trenton for December

The chart shows the monthly maximum UV Index (UVI) for Trenton in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Trenton typically reaches 3, which falls under the moderate exposure category.

Data source: Trenton December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Trenton Compares to Other Months

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.

This table compares monthly weather conditions in Trenton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	57 mm (2.2 inches)	91%	moderate
February Weather	-3°C (27°F)	67 mm (2.7 inches)	92%	moderate
March Weather	2°C (36°F)	50 mm (2.0 inches)	84%	high
April Weather	7°C (45°F)	62 mm (2.4 inches)	74%	very high
May Weather	12°C (54°F)	47 mm (1.9 inches)	62%	very high
June Weather	19°C (66°F)	19 mm (0.8 inches)	56%	extreme
July Weather	24°C (75°F)	10 mm (0.4 inches)	44%	extreme
August Weather	22°C (72°F)	14 mm (0.6 inches)	37%	very high
September Weather	17°C (62°F)	30 mm (1.2 inches)	46%	very high
October Weather	8°C (46°F)	37 mm (1.5 inches)	67%	high
November Weather	2°C (36°F)	42 mm (1.7 inches)	84%	moderate
December Weather	-4°C (25°F)	46 mm (1.8 inches)	88%	moderate