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December Weather in Cambridge, United States

Last updated: June 24, 2025

In December, the average temperature in Cambridge, United States hovers around -1°C (30°F). While you might experience bone-chilling lows of -23°C (-8°F), the mercury can occasionally rise to a pleasant 22°C (72°F). Expect about 36 mm (1.4 in) of precipitation spread over 5 days, accompanied by a high average humidity of 83%. Stay prepared for a mix of chilly and mild days!

December Temperature in Cambridge

In December in Cambridge, the average temperature is -1°C (30°F). Maximum temperatures can reach 22°C (72°F), while minimums can drop as low as -23°C (-8°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

December Weather in Cambridge: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Cambridge, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cambridge, December typically has an average temperature of -1°C (30°F), with highs reaching up to 22°C (72°F) and lows dropping to around -23°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec212238486274767368523730
Data source: Temperature data for Cambridge 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 Cambridge

In Cambridge in December, the precipitation amount is 36 mm (1.4 in) over the course of 5 days.

December Precipitation Trends in Cambridge

The chart displays monthly precipitation patterns in Cambridge, 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 Cambridge, December typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec3642777915810278721211304136
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Cambridge

In Cambridge in December humidity is 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

December Average Humidity in Cambridge

This chart illustrates the average monthly humidity levels in Cambridge, 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 Cambridge 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 Cambridge

In Cambridge 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 Cambridge, you can check the information here.

Maximum UV Index Levels in Cambridge for December

The chart shows the monthly maximum UV Index (UVI) for Cambridge 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 Cambridge typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Cambridge 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 Cambridge Compares to Other Months

Weather in Cambridge varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Cambridge, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Cambridge, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)36 mm (1.4 inches)78%moderate
February Weather-6°C (22°F)42 mm (1.7 inches)80%moderate
March Weather3°C (39°F)77 mm (3.0 inches)77%high
April Weather9°C (49°F)79 mm (3.1 inches)77%very high
May Weather17°C (62°F)158 mm (6.2 inches)77%very high
June Weather23°C (74°F)102 mm (4.0 inches)81%extreme
July Weather25°C (77°F)78 mm (3.1 inches)81%very high
August Weather23°C (73°F)72 mm (2.8 inches)77%very high
September Weather20°C (68°F)121 mm (4.8 inches)73%very high
October Weather11°C (52°F)130 mm (5.1 inches)75%high
November Weather3°C (38°F)41 mm (1.6 inches)85%moderate
December Weather-1°C (30°F)36 mm (1.4 inches)83%moderate

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