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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 (34°F), with extremes ranging from a frigid -25°C (-12°F) to a pleasant 23°C (73°F). Expect some wet days with a total precipitation of 34 mm (1.4 in) over approximately 4 days. The average humidity sits at a comfortable 83%, adding to the distinctive climate of the region.

December Temperature in Princeton

In December in Princeton, the average temperature is 1°C (34°F). Maximum temperatures can reach 23°C (73°F), while the minimum can drop as low as -25°C (-12°F). Be prepared for a wide range of temperatures, making it essential to pack layers 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 1°C (34°F), with highs reaching up to 23°C (73°F) and lows dropping to around -25°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec252842516475787569544033
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 34 mm (1.4 in) spread over a period of 4 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 34 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec484410378158124106881191545534
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 83%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making travel uncomfortable as the damp cold seeps into your bones, adding an extra layer of heaviness to the air that can leave you feeling sluggish and fatigued.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910111198643
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 (26°F)48 mm (1.9 inches)78%moderate
February Weather-2°C (28°F)44 mm (1.7 inches)80%moderate
March Weather6°C (42°F)103 mm (4.0 inches)77%high
April Weather10°C (51°F)78 mm (3.1 inches)77%very high
May Weather18°C (64°F)158 mm (6.2 inches)77%very high
June Weather24°C (76°F)124 mm (4.9 inches)81%extreme
July Weather26°C (78°F)106 mm (4.2 inches)81%extreme
August Weather24°C (75°F)88 mm (3.5 inches)77%very high
September Weather21°C (70°F)119 mm (4.7 inches)73%very high
October Weather12°C (54°F)154 mm (6.1 inches)75%high
November Weather5°C (40°F)55 mm (2.2 inches)85%moderate
December Weather1°C (34°F)34 mm (1.4 inches)83%moderate

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