December Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in December hovers around -3°C (26°F). Temperatures can dip as low as -23°C (-9°F), while reaching a maximum of 15°C (59°F). Expect some rain, with precipitation amounting to 120 mm (4.7 in) across approximately 11 days. Moreover, the air feels quite humid, with an average humidity of 84%.

December Temperature in Princeton

In December in Princeton, the average temperature is -3°C (26°F), with maximums reaching 15°C (59°F) and minimums dropping as low as -23°C (-9°F). Be prepared for a wide range of temperatures when traveling to Princeton during this month.

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

The chart illustrates December 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, December typically has an average temperature of -3°C (26°F), with highs reaching up to 15°C (59°F) and lows dropping to around -23°C (-9°F).

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

December Precipitation in Princeton

In Princeton in December, the precipitation amount is 120 mm (4.7 in) during a span of 11 days.

December Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Princeton, December typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Princeton

In Princeton in December, humidity is 84%. With an average temperature of -3°C (26°F), this humidity feels like an icy mist clinging to your skin, making every breath a struggle as the cold seeps in, creating a challenging environment for traveling.

December Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Princeton is approximately 84%, offering insight into how humid the weather typically is during this month.

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

December UV Index in Princeton

In Princeton in December, 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 December

The chart shows the monthly maximum UV Index (UVI) for Princeton in December, 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 December, the maximum UV index in Princeton typically reaches 2, which falls under the low exposure category.

Data source: Princeton December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	96 mm (3.8 inches)	88%	low
February Weather	-5°C (23°F)	88 mm (3.5 inches)	88%	moderate
March Weather	-1°C (30°F)	71 mm (2.8 inches)	85%	moderate
April Weather	6°C (42°F)	119 mm (4.7 inches)	81%	high
May Weather	12°C (53°F)	104 mm (4.1 inches)	76%	very high
June Weather	17°C (63°F)	91 mm (3.6 inches)	74%	very high
July Weather	20°C (69°F)	91 mm (3.6 inches)	74%	very high
August Weather	20°C (69°F)	77 mm (3.0 inches)	74%	very high
September Weather	16°C (61°F)	87 mm (3.4 inches)	77%	high
October Weather	10°C (50°F)	110 mm (4.3 inches)	82%	moderate
November Weather	3°C (37°F)	128 mm (5.0 inches)	85%	moderate
December Weather	-3°C (26°F)	120 mm (4.7 inches)	84%	low