December Weather in Cambridge, United States

Last updated: June 24, 2025

In Cambridge, United States, the average temperature in December hovers around -5°C (24°F), with a minimum plunging to -26°C (-14°F) and a maximum reaching 15°C (59°F). Expect 120 mm (4.7 in) of precipitation spread over 10 days, accompanied by an average humidity of around 84%. Prepare for a chilly and damp climate!

December Temperature in Cambridge

In December in Cambridge, the average temperature is -5°C (24°F), with maximums reaching 15°C (59°F) and minimums plummeting to as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures, ensuring they dress in layers to stay comfortable in both chilly and mild conditions.

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 -5°C (24°F), with highs reaching up to 15°C (59°F) and lows dropping to around -26°C (-14°F).

Data source: Temperature data for Cambridge generated using information from the Copernicus Climate Change Service.

December Precipitation in Cambridge

In Cambridge in December, the precipitation amount is 120 mm (4.7 in) spread over a duration of 10 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 120 mm (4.7 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Cambridge

In Cambridge in December, humidity is 84%. With an average temperature of -5°C (24°F), this humidity feels like an icy blanket wrapped around you, making the air feel even colder and more biting, which can be quite uncomfortable for traveling.

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 84%, offering insight into how humid the weather typically is during this month.

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 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 Cambridge, you can visit Hourly UV Index in Cambridge.

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 2, which falls under the low exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	88 mm (3.5 inches)	88%	low
February Weather	-6°C (21°F)	83 mm (3.3 inches)	88%	moderate
March Weather	-2°C (29°F)	75 mm (2.9 inches)	85%	moderate
April Weather	5°C (42°F)	126 mm (5.0 inches)	81%	very high
May Weather	12°C (54°F)	95 mm (3.7 inches)	76%	very high
June Weather	17°C (64°F)	85 mm (3.4 inches)	74%	very high
July Weather	20°C (69°F)	103 mm (4.1 inches)	74%	very high
August Weather	20°C (68°F)	81 mm (3.2 inches)	74%	very high
September Weather	16°C (60°F)	74 mm (2.9 inches)	77%	high
October Weather	9°C (49°F)	129 mm (5.1 inches)	82%	moderate
November Weather	1°C (34°F)	115 mm (4.5 inches)	85%	moderate
December Weather	-5°C (24°F)	120 mm (4.7 inches)	84%	low