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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 4°C (39°F). Expect chilly conditions, with minimum temperatures dropping to -15°C (6°F) and maximums reaching 19°C (67°F). Be prepared for 96 mm (3.8 in) of precipitation over 9 days, contributing to an average humidity level of 86%.

December Temperature in Princeton

In December in Princeton, the average temperature is 4°C (39°F). The maximum can reach 19°C (67°F), and the minimum can be as low as -15°C (6°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

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 4°C (39°F), with highs reaching up to 19°C (67°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec344045536268727066574339
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 96 mm (3.8 in) spread over a period of 9 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 96 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec77124100120133119781091091157296
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 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010753
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 Weather1°C (34°F)77 mm (3.0 inches)87%moderate
February Weather4°C (40°F)124 mm (4.9 inches)87%high
March Weather7°C (45°F)100 mm (3.9 inches)86%very high
April Weather11°C (53°F)120 mm (4.7 inches)84%very high
May Weather17°C (62°F)133 mm (5.2 inches)83%extreme
June Weather20°C (68°F)119 mm (4.7 inches)83%extreme
July Weather22°C (72°F)78 mm (3.1 inches)79%extreme
August Weather21°C (70°F)109 mm (4.3 inches)66%very high
September Weather19°C (66°F)109 mm (4.3 inches)68%very high
October Weather14°C (57°F)115 mm (4.5 inches)78%high
November Weather6°C (43°F)72 mm (2.8 inches)89%moderate
December Weather4°C (39°F)96 mm (3.8 inches)86%moderate

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