January Weather in Princeton, United States

Last updated: June 24, 2025

In January, the average temperature in Princeton, United States is a chilly -10°C (15°F). Expect the temperature to dip as low as -34°C (-29°F) at times, but it can also rise to a mild 7°C (45°F). During this month, precipitation usually falls around 19 mm (0.8 in) over approximately 4 days, while humidity levels will be high, averaging 87%.

January Temperature in Princeton

In January in Princeton, the average temperature is -10°C (15°F). The maximum can reach 7°C (45°F) and the minimum can be as low as -34°C (-29°F). Travelers should be prepared for extremely cold conditions and pack appropriately for both frigid temperatures and occasional warmer days.

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 -10°C (15°F), with highs reaching up to 7°C (45°F) and lows dropping to around -34°C (-29°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 19 mm (0.8 in) over a span of 4 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 19 mm (0.8 inches) of precipitation spread over approximately 4 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 Princeton

In Princeton in January, humidity is 87%. With an average temperature of -10°C (15°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and the air feel heavy with frost.

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 87%, 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 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Princeton, you can visit Hourly UV Index in Princeton.

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 2, which falls under the low 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	-10°C (15°F)	19 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	28 mm (1.1 inches)	90%	moderate
March Weather	0°C (32°F)	51 mm (2.0 inches)	85%	moderate
April Weather	6°C (42°F)	94 mm (3.7 inches)	84%	high
May Weather	15°C (58°F)	98 mm (3.9 inches)	78%	very high
June Weather	21°C (71°F)	75 mm (3.0 inches)	80%	very high
July Weather	23°C (74°F)	101 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	142 mm (5.6 inches)	81%	very high
September Weather	17°C (63°F)	116 mm (4.6 inches)	81%	high
October Weather	8°C (47°F)	106 mm (4.2 inches)	84%	moderate
November Weather	0°C (32°F)	33 mm (1.3 inches)	88%	moderate
December Weather	-6°C (22°F)	48 mm (1.9 inches)	84%	low