January Weather in Trenton, United States

Last updated: June 24, 2025

In Trenton, United States, the average temperature in January hovers around 14°C (57°F), offering a mild climate. However, temperatures can fluctuate significantly, with a minimum of -5°C (23°F) and soaring up to a maximum of 28°C (83°F). During this month, expect 55 mm (2.2 in) of precipitation spread over about 5 days, contributing to an average humidity level of 83%.

January Temperature in Trenton

In January in Trenton, the average temperature is 14°C (57°F). Maximum can reach 28°C (83°F), and minimum can be as low as -5°C (23°F). This variability makes it essential for travelers to pack accordingly for their visit.

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 14°C (57°F), with highs reaching up to 28°C (83°F) and lows dropping to around -5°C (23°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 55 mm (2.2 in) distributed over a period of 5 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 55 mm (2.2 inches) of precipitation spread over approximately 5 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 83%. With an average temperature of 14°C (57°F), this humidity feels like you're stepping into a warm, damp embrace that can make outdoor activities quite uncomfortable, often leaving you sweaty and exhausted if you're not prepared with plenty of water and breathable clothing.

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 83%, 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 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Trenton.

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 5, 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	14°C (57°F)	55 mm (2.2 inches)	83%	moderate
February Weather	17°C (63°F)	67 mm (2.6 inches)	82%	very high
March Weather	18°C (65°F)	35 mm (1.4 inches)	78%	very high
April Weather	21°C (70°F)	78 mm (3.1 inches)	77%	extreme
May Weather	25°C (77°F)	98 mm (3.9 inches)	75%	extreme
June Weather	27°C (80°F)	170 mm (6.7 inches)	76%	extreme
July Weather	27°C (81°F)	186 mm (7.3 inches)	79%	extreme
August Weather	27°C (82°F)	178 mm (7.0 inches)	78%	extreme
September Weather	27°C (80°F)	126 mm (5.0 inches)	83%	very high
October Weather	24°C (76°F)	72 mm (2.8 inches)	81%	very high
November Weather	18°C (64°F)	57 mm (2.2 inches)	83%	high
December Weather	15°C (60°F)	102 mm (4.0 inches)	86%	moderate