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December Weather in Trenton, United States

Last updated: June 24, 2025

In Trenton, United States, the average temperature in December hovers around 8°C (46°F). You can expect a minimum of -8°C (18°F) and a potential maximum reaching 23°C (73°F). During this month, precipitation amounts to about 150 mm (5.9 in) spread across 11 days, with an average humidity level of 88%.

December Temperature in Trenton

In December in Trenton, the average temperature is 8°C (46°F), with maximums reaching 23°C (73°F) and minimums dropping to as low as -8°C (18°F). Be prepared for a wide range of temperatures, so pack accordingly for your travels!

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 8°C (46°F), with highs reaching up to 23°C (73°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854607075787773645046
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 total precipitation amount reaches 150 mm (5.9 in) over the course of 11 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 150 mm (5.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec10919118416210614412215012114279150
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 88%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration feel much more uncomfortable than the temperature alone would suggest.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111119764
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 Weather6°C (43°F)109 mm (4.3 inches)87%moderate
February Weather9°C (48°F)191 mm (7.5 inches)87%high
March Weather12°C (54°F)184 mm (7.2 inches)85%very high
April Weather16°C (60°F)162 mm (6.4 inches)82%very high
May Weather21°C (70°F)106 mm (4.2 inches)83%extreme
June Weather24°C (75°F)144 mm (5.7 inches)82%extreme
July Weather26°C (79°F)122 mm (4.8 inches)78%extreme
August Weather25°C (77°F)150 mm (5.9 inches)67%extreme
September Weather23°C (74°F)121 mm (4.8 inches)64%very high
October Weather18°C (64°F)142 mm (5.6 inches)74%high
November Weather10°C (50°F)79 mm (3.1 inches)87%high
December Weather8°C (46°F)150 mm (5.9 inches)88%moderate

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