December Weather in Plymouth, United States

Last updated: June 24, 2025

In December, the average temperature in Plymouth, United States hovers around 8°C (46°F), with a chill that can drop as low as -2°C (29°F) and peaks reaching 21°C (70°F). This month also sees approximately 156 mm (6.1 in) of precipitation spread over about 10 days, contributing to a notably high average humidity of 83%. Be prepared for a mix of cool weather and damp conditions as you explore!

December Temperature in Plymouth

In December in Plymouth, the average temperature is 8°C (46°F). Maximums can reach 21°C (70°F), while minimums can drop as low as -2°C (29°F). Be prepared for a range of temperatures, so pack accordingly to enjoy your travels!

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

The chart illustrates December temperature patterns in Plymouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plymouth, December typically has an average temperature of 8°C (46°F), with highs reaching up to 21°C (70°F) and lows dropping to around -2°C (29°F).

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

December Precipitation in Plymouth

In Plymouth in December, the precipitation amount is 156 mm (6.1 in) over a span of 10 days.

December Precipitation Trends in Plymouth

The chart displays monthly precipitation patterns in Plymouth, 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 Plymouth, December typically receives around 156 mm (6.1 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Plymouth

In Plymouth in December, humidity is 83%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that seeps into your bones, making even short outings feel quite uncomfortable and prompting travelers to bundle up and seek shelter more frequently.

December Average Humidity in Plymouth

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

In Plymouth 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 Plymouth, you can check the information here.

Maximum UV Index Levels in Plymouth for December

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

Data source: Plymouth 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 Plymouth Compares to Other Months

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

This table compares monthly weather conditions in Plymouth, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	191 mm (7.5 inches)	84%	moderate
February Weather	8°C (48°F)	190 mm (7.5 inches)	84%	moderate
March Weather	10°C (50°F)	210 mm (8.3 inches)	83%	very high
April Weather	13°C (57°F)	96 mm (3.8 inches)	81%	very high
May Weather	17°C (62°F)	57 mm (2.2 inches)	74%	very high
June Weather	22°C (72°F)	6 mm (0.2 inches)	64%	extreme
July Weather	25°C (77°F)	0 mm (0.0 inches)	44%	extreme
August Weather	24°C (76°F)	0 mm (0.0 inches)	36%	very high
September Weather	21°C (71°F)	10 mm (0.4 inches)	44%	very high
October Weather	16°C (61°F)	49 mm (1.9 inches)	65%	high
November Weather	11°C (52°F)	103 mm (4.1 inches)	84%	moderate
December Weather	8°C (46°F)	156 mm (6.1 inches)	83%	moderate