January Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in January hovers around -7°C (20°F). However, be prepared for a temperature range that can plummet to a chilling -34°C (-28°F) or rise to a more bearable 10°C (50°F). During this month, you can expect approximately 46 mm (1.8 in) of precipitation spread across 7 days, all while grappling with an average humidity level of 85%. Stay warm and dry!

January Temperature in Princeton

In January in Princeton, the average temperature is -7°C (20°F). Maximums can reach 10°C (50°F) and minimums can be as low as -34°C (-28°F). Be sure to pack warm clothing and prepare for varying conditions while traveling to Princeton during this time.

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

The chart illustrates January temperature patterns in Princeton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Princeton, January typically has an average temperature of -7°C (20°F), with highs reaching up to 10°C (50°F) and lows dropping to around -34°C (-28°F).

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

January Precipitation in Princeton

In Princeton in January, the precipitation amount is 46 mm (1.8 in) over the course of 7 days.

January Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, 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 Princeton, January typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 7 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 Princeton

In Princeton in January humidity is 85%. With an average temperature of -7°C (20°F), this humidity feels like an icy breath that clings to your skin, making travel challenging as the cold seeps into your bones while you navigate through the damp air.

January Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, 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 Princeton is approximately 85%, 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 Princeton

In Princeton 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 Princeton, you can check the information here.

Maximum UV Index Levels in Princeton for January

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

Data source: Princeton 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 Princeton Compares to Other Months

Weather in Princeton varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Princeton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Princeton, 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 (20°F)	46 mm (1.8 inches)	85%	moderate
February Weather	-6°C (21°F)	50 mm (2.0 inches)	85%	moderate
March Weather	1°C (34°F)	60 mm (2.4 inches)	85%	moderate
April Weather	7°C (45°F)	99 mm (3.9 inches)	85%	very high
May Weather	15°C (59°F)	117 mm (4.6 inches)	78%	very high
June Weather	21°C (70°F)	108 mm (4.3 inches)	80%	very high
July Weather	23°C (74°F)	109 mm (4.3 inches)	78%	very high
August Weather	21°C (71°F)	100 mm (3.9 inches)	76%	very high
September Weather	18°C (64°F)	89 mm (3.5 inches)	79%	high
October Weather	10°C (51°F)	105 mm (4.1 inches)	83%	moderate
November Weather	2°C (36°F)	46 mm (1.8 inches)	88%	moderate
December Weather	-2°C (28°F)	48 mm (1.9 inches)	81%	low