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December Weather in Trenton, United States

Last updated: June 24, 2025

In December, the average temperature in Trenton, United States is a cool 10°C (50°F). Expect a minimum of -5°C (23°F) and a possible maximum of 25°C (77°F). During this period, precipitation averages 120 mm (4.7 in) over 10 days, contributing to an average humidity level of 84%.

December Temperature in Trenton

In December in Trenton, the average temperature is 10°C (50°F). The maximum can reach 25°C (77°F) and the minimum can be as low as -5°C (23°F). This makes it essential for travelers to pack layers to stay comfortable throughout the day.

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 10°C (50°F), with highs reaching up to 25°C (77°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec465254637177807975675450
Data source: Temperature data for Trenton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Trenton

In Trenton in December, the precipitation amount is 120 mm (4.7 in) spread over a duration 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 120 mm (4.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec75986811412717516420419971103120
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Trenton

In Trenton in December, humidity is 84%. With an average temperature of 10°C (50°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less comfortable and prompting travelers to seek refuge in cozy, warm cafes or indoor attractions.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%81%80%80%81%82%83%83%80%80%83%84%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Trenton for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109854
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.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)75 mm (3.0 inches)84%moderate
February Weather11°C (52°F)98 mm (3.9 inches)81%high
March Weather12°C (55°F)67 mm (2.7 inches)80%very high
April Weather17°C (63°F)114 mm (4.5 inches)80%very high
May Weather22°C (71°F)127 mm (5.0 inches)81%extreme
June Weather25°C (77°F)175 mm (6.9 inches)82%extreme
July Weather27°C (80°F)164 mm (6.5 inches)83%extreme
August Weather26°C (79°F)204 mm (8.0 inches)82%very high
September Weather24°C (76°F)199 mm (7.8 inches)80%very high
October Weather20°C (68°F)71 mm (2.8 inches)79%very high
November Weather12°C (55°F)103 mm (4.0 inches)83%moderate
December Weather10°C (50°F)120 mm (4.7 inches)84%moderate

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