December Weather in Princeton, United States

Last updated: June 24, 2025

In December, the average temperature in Princeton, United States hovers around 0°C (32°F). However, temperatures can vary dramatically, with a minimum of -21°C (-6°F) and a maximum reaching 21°C (70°F). Expect approximately 48 mm (1.9 in) of precipitation over 5 days, coupled with an average humidity of 84%. Prepare accordingly for this chilly and damp climate!

December Temperature in Princeton

In December in Princeton, the average temperature is 0°C (32°F), with maximums reaching up to 21°C (70°F) and minimums plummeting as low as -21°C (-6°F). Be prepared for a diverse range of temperatures if you plan to visit during this time.

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 0°C (32°F), with highs reaching up to 21°C (70°F) and lows dropping to around -21°C (-6°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 48 mm (1.9 in) spread over the course of 5 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 48 mm (1.9 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Princeton

In Princeton in December, humidity is 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.

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	-5°C (23°F)	55 mm (2.2 inches)	81%	moderate
February Weather	-4°C (26°F)	60 mm (2.4 inches)	81%	moderate
March Weather	4°C (40°F)	88 mm (3.5 inches)	81%	high
April Weather	9°C (49°F)	106 mm (4.2 inches)	82%	very high
May Weather	17°C (62°F)	148 mm (5.8 inches)	78%	very high
June Weather	23°C (73°F)	134 mm (5.3 inches)	81%	extreme
July Weather	25°C (77°F)	85 mm (3.4 inches)	79%	very high
August Weather	23°C (74°F)	81 mm (3.2 inches)	77%	very high
September Weather	20°C (68°F)	117 mm (4.6 inches)	78%	very high
October Weather	12°C (54°F)	112 mm (4.4 inches)	78%	high
November Weather	4°C (39°F)	48 mm (1.9 inches)	87%	moderate
December Weather	0°C (32°F)	48 mm (1.9 inches)	84%	low