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December Weather in Princeton, United States

Last updated: June 24, 2025

In December, the average temperature in Princeton, United States hovers around 6°C (44°F). Expect a chill in the air, with minimum temperatures plunging to -11°C (13°F) and occasionally reaching a warm 21°C (71°F). Precipitation is notable, totaling 119 mm (4.7 in) over approximately 10 days, contributing to an average humidity of 88%.

December Temperature in Princeton

In December in Princeton, the average temperature is 6°C (44°F). Maximum temperatures can reach 21°C (71°F), while the minimum can drop as low as -11°C (13°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 6°C (44°F), with highs reaching up to 21°C (71°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec384150586977817874634843
Data source: Temperature data for Princeton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Princeton

In Princeton in December, the total precipitation amount is 119 mm (4.7 in) over the span of 10 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 119 mm (4.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec971511351381191181061049310996119
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Princeton

In Princeton in December humidity is 88%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures less inviting and requiring warm, layered clothing to stay comfortable while exploring.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%88%
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 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 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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111110109753
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.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)97 mm (3.8 inches)86%moderate
February Weather5°C (42°F)150 mm (5.9 inches)84%high
March Weather10°C (51°F)135 mm (5.3 inches)84%high
April Weather14°C (58°F)138 mm (5.4 inches)80%very high
May Weather21°C (69°F)118 mm (4.7 inches)82%extreme
June Weather25°C (77°F)118 mm (4.6 inches)83%extreme
July Weather27°C (81°F)106 mm (4.2 inches)79%very high
August Weather26°C (78°F)104 mm (4.1 inches)76%very high
September Weather23°C (74°F)93 mm (3.7 inches)75%very high
October Weather17°C (63°F)108 mm (4.3 inches)74%high
November Weather9°C (48°F)96 mm (3.8 inches)85%moderate
December Weather6°C (44°F)119 mm (4.7 inches)88%moderate

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