January Weather in Plymouth, United States

Last updated: June 24, 2025

In January, the average temperature in Plymouth, United States hovers around -2°C (28°F). However, be prepared for a wide range, as temperatures can plunge to a brisk -29°C (-19°F) or climb to a comfortable 18°C (65°F). During this month, expect 73 mm (2.9 in) of precipitation spread over approximately 8 days, contributing to an average humidity of 85%. Come dressed for the chill, and enjoy the unique beauty of Plymouth in winter!

January Temperature in Plymouth

In January in Plymouth, the average temperature is -2°C (28°F). The maximum can reach 18°C (65°F), while the minimum can drop as low as -29°C (-19°F). It's essential to pack layers and prepare for significant temperature fluctuations while traveling to Plymouth during this time.

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

The chart illustrates January 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, January typically has an average temperature of -2°C (28°F), with highs reaching up to 18°C (65°F) and lows dropping to around -29°C (-19°F).

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

January Precipitation in Plymouth

In Plymouth in January, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

January Precipitation Trends in Plymouth

The chart displays monthly precipitation patterns in Plymouth, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Plymouth, January typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Plymouth

In Plymouth in January, humidity is 85%. With an average temperature of -2°C (28°F), this humidity feels like an icy grip that clings uncomfortably to your skin, making every step feel heavier and hastening the chill that seeps into your bones, discouraging long outdoor excursions and leaving you yearning for warmth and shelter.

January Average Humidity in Plymouth

This chart illustrates the average monthly humidity levels in Plymouth, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Plymouth is approximately 85%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Plymouth

In Plymouth in January, 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 January

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

Data source: Plymouth January 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 January 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 January’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 January’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