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December Weather in Trenton, United States

Last updated: June 24, 2025

In December, the average temperature in Trenton, United States hovers around 2°C (36°F). You might experience a chilly minimum of -21°C (-5°F), while the warmest days can reach up to 23°C (74°F). Expect about 34 mm (1.3 in) of precipitation spread across 5 days, with the average humidity at a high 86%. Stay prepared for both the cold and the occasional rain!

December Temperature in Trenton

In December in Trenton, the average temperature is 2°C (36°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop to as low as -21°C (-5°F). Be prepared for a wide range of weather conditions if you plan to travel during this time.

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 2°C (36°F), with highs reaching up to 23°C (74°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec283044526576797570554235
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 34 mm (1.3 in) over the course of 5 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 34 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec564610485181142110103961375334
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 86%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm for travel.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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 Weather-2°C (28°F)56 mm (2.2 inches)80%moderate
February Weather-1°C (30°F)46 mm (1.8 inches)78%moderate
March Weather7°C (44°F)104 mm (4.1 inches)75%high
April Weather11°C (53°F)85 mm (3.4 inches)77%very high
May Weather18°C (65°F)181 mm (7.1 inches)82%very high
June Weather24°C (76°F)142 mm (5.6 inches)83%extreme
July Weather26°C (79°F)110 mm (4.3 inches)81%extreme
August Weather24°C (76°F)103 mm (4.1 inches)78%very high
September Weather21°C (71°F)96 mm (3.8 inches)72%very high
October Weather13°C (56°F)137 mm (5.4 inches)72%high
November Weather5°C (42°F)53 mm (2.1 inches)84%moderate
December Weather2°C (36°F)34 mm (1.3 inches)86%moderate

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