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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 1°C (33°F). Be prepared for a range of temperatures that can dip to a chilling -21°C (-6°F) or soar to a pleasant 20°C (69°F). Expect about 50 mm (2.0 in) of precipitation over 6 days, contributing to an average humidity of 84%.

December Temperature in Princeton

In December in Princeton, the average temperature is 1°C (33°F), with maximums reaching 20°C (69°F) and minimums dipping as low as -21°C (-6°F). Be prepared for a wide range of temperatures if you plan to travel 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 1°C (33°F), with highs reaching up to 20°C (69°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec252740506373767469553933
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 precipitation amount is 50 mm (2.0 in) over the course of 6 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 50 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec57649711416215910474941325450
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 84%. With an average temperature of 1°C (33°F), this humidity feels like an icy blanket, making travel uncomfortable and breathless as the frigid air clings to your skin and dampens your clothes.

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.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098642
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 Weather-4°C (25°F)57 mm (2.3 inches)82%moderate
February Weather-3°C (28°F)64 mm (2.5 inches)83%moderate
March Weather5°C (41°F)97 mm (3.8 inches)84%high
April Weather10°C (50°F)114 mm (4.5 inches)85%very high
May Weather17°C (63°F)162 mm (6.4 inches)79%very high
June Weather23°C (73°F)159 mm (6.2 inches)82%extreme
July Weather25°C (76°F)104 mm (4.1 inches)80%very high
August Weather23°C (74°F)74 mm (2.9 inches)81%very high
September Weather20°C (69°F)93 mm (3.7 inches)80%very high
October Weather13°C (55°F)132 mm (5.2 inches)82%high
November Weather4°C (39°F)54 mm (2.1 inches)88%moderate
December Weather1°C (33°F)50 mm (2.0 inches)84%low

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