January Weather in Somerville, United States

Last updated: June 24, 2025

In January, the average temperature in Somerville, United States hovers around -4°C (25°F). Temperatures can dip as low as -24°C (-10°F) and reach a maximum of 13°C (57°F). Be prepared for a damp month, as 88 mm (3.5 in) of precipitation is expected over 8 days, accompanied by a high average humidity of 88%.

January Temperature in Somerville

In January in Somerville, the average temperature is -4°C (25°F). Maximum can reach 13°C (57°F), and minimum can be as low as -24°C (-10°F). Travelers should prepare for a wide range of temperatures, from chilly days to freezing nights, when visiting during this time.

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

The chart illustrates January temperature patterns in Somerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somerville, January typically has an average temperature of -4°C (25°F), with highs reaching up to 13°C (57°F) and lows dropping to around -24°C (-10°F).

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

January Precipitation in Somerville

In Somerville in January, the precipitation amount is 88 mm (3.5 in) over the course of 8 days.

January Precipitation Trends in Somerville

The chart displays monthly precipitation patterns in Somerville, 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 Somerville, January typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Somerville

In Somerville in January, humidity is 88%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making outdoor excursions brisk and invigorating, yet challenging as you navigate the frosty air.

January Average Humidity in Somerville

This chart illustrates the average monthly humidity levels in Somerville, 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 Somerville is approximately 88%, 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 Somerville

In Somerville in January, 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 Somerville, you can visit Hourly UV Index in Somerville.

Maximum UV Index Levels in Somerville for January

The chart shows the monthly maximum UV Index (UVI) for Somerville 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 Somerville typically reaches 2, which falls under the low exposure category.

Data source: Somerville 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 Somerville Compares to Other Months

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

This table compares monthly weather conditions in Somerville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	88 mm (3.5 inches)	88%	low
February Weather	-3°C (26°F)	86 mm (3.4 inches)	88%	moderate
March Weather	0°C (33°F)	72 mm (2.8 inches)	85%	moderate
April Weather	7°C (44°F)	124 mm (4.9 inches)	81%	high
May Weather	12°C (55°F)	80 mm (3.2 inches)	76%	very high
June Weather	18°C (65°F)	64 mm (2.5 inches)	74%	very high
July Weather	21°C (71°F)	105 mm (4.1 inches)	74%	very high
August Weather	21°C (70°F)	77 mm (3.0 inches)	74%	very high
September Weather	17°C (63°F)	73 mm (2.9 inches)	77%	high
October Weather	11°C (52°F)	129 mm (5.1 inches)	82%	moderate
November Weather	3°C (38°F)	109 mm (4.3 inches)	85%	moderate
December Weather	-2°C (28°F)	121 mm (4.8 inches)	84%	low