December Weather in Plymouth, United States

Last updated: June 24, 2025

In Plymouth, United States, the average temperature in December hovers around 1°C (34°F), with a chilly minimum dipping as low as -22°C (-7°F) and a pleasant maximum soaring up to 17°C (63°F). Expect about 61 mm (2.4 in) of precipitation spread over 8 days, while average humidity levels linger at a notable 86%.

December Temperature in Plymouth

In December in Plymouth, the average temperature is 1°C (34°F). Maximums can reach 17°C (63°F), and minimums can be as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures, making layering essential for comfort.

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 1°C (34°F), with highs reaching up to 17°C (63°F) and lows dropping to around -22°C (-7°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 61 mm (2.4 in) distributed over 8 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 61 mm (2.4 inches) of precipitation spread over approximately 8 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 Plymouth

In Plymouth in December, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

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 86%, 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 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 Plymouth, you can visit Hourly UV Index in Plymouth.

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 2, which falls under the low 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	-2°C (28°F)	73 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	76 mm (3.0 inches)	85%	moderate
March Weather	4°C (40°F)	102 mm (4.0 inches)	86%	high
April Weather	10°C (50°F)	103 mm (4.0 inches)	87%	very high
May Weather	17°C (62°F)	151 mm (6.0 inches)	81%	very high
June Weather	22°C (73°F)	116 mm (4.5 inches)	82%	very high
July Weather	24°C (76°F)	116 mm (4.6 inches)	81%	very high
August Weather	23°C (73°F)	101 mm (4.0 inches)	79%	very high
September Weather	20°C (68°F)	73 mm (2.9 inches)	78%	very high
October Weather	13°C (56°F)	118 mm (4.6 inches)	81%	high
November Weather	5°C (41°F)	78 mm (3.1 inches)	89%	moderate
December Weather	1°C (34°F)	61 mm (2.4 inches)	86%	low