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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 1°C (34°F), with a minimum of -17°C (3°F) and a potential maximum of 24°C (75°F). Expect about 21 mm (0.8 in) of precipitation spread over 4 days, while the average humidity sits at a comfortable 78%.

December Temperature in Trenton

In December in Trenton, the average temperature is 1°C (34°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop to as low as -17°C (3°F). Be prepared for a wide range of temperatures when traveling to Trenton 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 1°C (34°F), with highs reaching up to 24°C (75°F) and lows dropping to around -17°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec302942506075787569514234
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 21 mm (0.8 in) over a span of 4 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 21 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec1716664012255736553401521
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 78%. With an average temperature of 1°C (34°F), this humidity feels like an extra layer of chill in the air, making travel uncomfortable and damp, often leading to a persistent sense of cold that can seep into your bones, leaving you wishing for a warm shelter.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%80%64%64%76%79%77%79%70%64%75%78%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
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-1°C (30°F)17 mm (0.7 inches)73%moderate
February Weather-2°C (29°F)16 mm (0.6 inches)80%moderate
March Weather6°C (42°F)66 mm (2.6 inches)64%high
April Weather10°C (50°F)40 mm (1.6 inches)64%very high
May Weather16°C (61°F)122 mm (4.8 inches)76%very high
June Weather24°C (75°F)55 mm (2.2 inches)79%extreme
July Weather26°C (78°F)73 mm (2.9 inches)77%extreme
August Weather24°C (75°F)65 mm (2.6 inches)79%very high
September Weather21°C (69°F)53 mm (2.1 inches)70%very high
October Weather11°C (52°F)40 mm (1.6 inches)64%high
November Weather6°C (42°F)15 mm (0.6 inches)75%moderate
December Weather1°C (34°F)21 mm (0.8 inches)78%moderate

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