January Weather in Trenton, United States

Last updated: June 24, 2025

In January, the average temperature in Trenton, United States hovers around 7°C (45°F), with a minimum dipping to -14°C (7°F) and a maximum reaching 26°C (78°F). Visitors should prepare for approximately 71 mm (2.8 in) of precipitation over 7 days, coupled with an average humidity level of around 80%.

January Temperature in Trenton

In January in Trenton, the average temperature is 7°C (45°F). Maximums can reach 26°C (78°F), while minimums can drop as low as -14°C (7°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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 7°C (45°F), with highs reaching up to 26°C (78°F) and lows dropping to around -14°C (7°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 71 mm (2.8 in) over a span of 7 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 71 mm (2.8 inches) of precipitation spread over approximately 7 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Trenton

In Trenton in January, humidity is 80%. With an average temperature of 7°C (45°F), this humidity feels like you're wrapped in a damp blanket, making it quite uncomfortable for traveling and leaving you feeling chilly and clammy as you explore the area.

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 80%, 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 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 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 4, 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	7°C (45°F)	71 mm (2.8 inches)	80%	moderate
February Weather	9°C (48°F)	105 mm (4.1 inches)	79%	high
March Weather	15°C (59°F)	134 mm (5.3 inches)	78%	very high
April Weather	17°C (64°F)	162 mm (6.4 inches)	78%	very high
May Weather	23°C (73°F)	176 mm (6.9 inches)	81%	extreme
June Weather	27°C (81°F)	106 mm (4.2 inches)	78%	extreme
July Weather	29°C (84°F)	55 mm (2.2 inches)	73%	extreme
August Weather	28°C (83°F)	97 mm (3.8 inches)	66%	extreme
September Weather	25°C (78°F)	94 mm (3.7 inches)	65%	very high
October Weather	19°C (66°F)	160 mm (6.3 inches)	72%	very high
November Weather	13°C (55°F)	59 mm (2.3 inches)	82%	high
December Weather	10°C (50°F)	77 mm (3.0 inches)	87%	moderate