January Weather in Trenton, United States

Last updated: June 24, 2025

In Trenton, United States, the average temperature in January hovers around 0°C (32°F). While you might experience a chilling low of -26°C (-15°F), the thermometer can also reach a pleasant 20°C (69°F). Be prepared for about 81 mm (3.2 in) of precipitation spread over 10 days, contributing to an average humidity level of 88%.

January Temperature in Trenton

In January in Trenton, the average temperature is 0°C (32°F). Maximums can reach 20°C (68°F) while minimums can drop as low as -26°C (-15°F). Be prepared for a wide range of temperatures if you're planning to travel!

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

The chart illustrates January 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, January typically has an average temperature of 0°C (32°F), with highs reaching up to 20°C (69°F) and lows dropping to around -26°C (-15°F).

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

January Precipitation in Trenton

In Trenton in January, the precipitation amount is 81 mm (3.2 in) over a span of 10 days.

January Precipitation Trends in Trenton

The chart displays monthly precipitation patterns in Trenton, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Trenton, January typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Trenton

In Trenton in January, humidity is 88%. With an average temperature of 0°C (32°F), this humidity feels like a chilly, damp blanket enveloping you, making travel uncomfortable as every breath seems to carry the weight of the cold moisture, turning each step into a struggle against the biting chill.

January Average Humidity in Trenton

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

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

January UV Index in Trenton

In Trenton in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Trenton in January, 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 January, the maximum UV index in Trenton typically reaches 3, which falls under the moderate exposure category.

Data source: Trenton January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	81 mm (3.2 inches)	88%	moderate
February Weather	2°C (36°F)	108 mm (4.2 inches)	88%	moderate
March Weather	7°C (44°F)	130 mm (5.1 inches)	87%	high
April Weather	12°C (53°F)	109 mm (4.3 inches)	85%	very high
May Weather	18°C (65°F)	130 mm (5.1 inches)	81%	very high
June Weather	23°C (73°F)	137 mm (5.4 inches)	82%	very high
July Weather	25°C (77°F)	117 mm (4.6 inches)	81%	very high
August Weather	24°C (75°F)	94 mm (3.7 inches)	73%	very high
September Weather	21°C (70°F)	81 mm (3.2 inches)	73%	very high
October Weather	15°C (59°F)	100 mm (3.9 inches)	78%	high
November Weather	6°C (43°F)	98 mm (3.9 inches)	89%	moderate
December Weather	3°C (38°F)	103 mm (4.0 inches)	87%	moderate