December Weather in Cohasset, United States

Last updated: June 24, 2025

In December, the average temperature in Cohasset, United States hovers around 6°C (43°F), with daily variations ranging from a chilly -5°C (24°F) at night to a pleasant 22°C (71°F) on warmer days. Expect precipitation to total about 154 mm (6.1 in) over 11 days, contributing to the average humidity of 83% that envelops the area.

December Temperature in Cohasset

In December in Cohasset, the average temperature is 6°C (43°F). Maximum temperatures can reach 22°C (71°F), while minimums may drop as low as -5°C (24°F). Be sure to pack layers for a comfortable travel experience, as the weather can vary significantly during this time.

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

The chart illustrates December temperature patterns in Cohasset, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cohasset, December typically has an average temperature of 6°C (43°F), with highs reaching up to 22°C (71°F) and lows dropping to around -5°C (24°F).

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

December Precipitation in Cohasset

In Cohasset in December, the precipitation amount is 154 mm (6.1 in), falling over the course of 11 days.

December Precipitation Trends in Cohasset

The chart displays monthly precipitation patterns in Cohasset, 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 Cohasset, December typically receives around 154 mm (6.1 inches) of precipitation spread over approximately 11 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 Cohasset

In Cohasset in December, humidity is 83%. With an average temperature of 6°C (43°F), this humidity feels like a brisk chill that can make you feel colder than the actual temperature, often leading to a damp and uncomfortable experience for traveling.

December Average Humidity in Cohasset

This chart illustrates the average monthly humidity levels in Cohasset, 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 Cohasset is approximately 83%, 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 Cohasset

In Cohasset 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 Cohasset, you can check the information here.

Maximum UV Index Levels in Cohasset for December

The chart shows the monthly maximum UV Index (UVI) for Cohasset 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 Cohasset typically reaches 3, which falls under the moderate exposure category.

Data source: Cohasset 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 Cohasset Compares to Other Months

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

This table compares monthly weather conditions in Cohasset, 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 (44°F)	200 mm (7.9 inches)	84%	moderate
February Weather	7°C (46°F)	206 mm (8.1 inches)	84%	moderate
March Weather	9°C (48°F)	177 mm (7.0 inches)	83%	high
April Weather	13°C (56°F)	90 mm (3.6 inches)	81%	very high
May Weather	17°C (63°F)	62 mm (2.4 inches)	74%	extreme
June Weather	23°C (73°F)	15 mm (0.6 inches)	64%	extreme
July Weather	27°C (81°F)	2 mm (0.1 inches)	44%	extreme
August Weather	26°C (78°F)	4 mm (0.2 inches)	36%	very high
September Weather	21°C (71°F)	15 mm (0.6 inches)	44%	very high
October Weather	15°C (60°F)	58 mm (2.3 inches)	65%	high
November Weather	10°C (50°F)	107 mm (4.2 inches)	84%	moderate
December Weather	6°C (43°F)	154 mm (6.1 inches)	83%	moderate