January Weather in Somerville, United States

Last updated: June 24, 2025

In Somerville, United States, the average temperature in January hovers around 7°C (44°F). During this time, temperatures can dip as low as -14°C (8°F) and reach a maximum of 25°C (77°F). Expect 114 mm (4.5 in) of precipitation spread over about 9 days, accompanied by a high average humidity of 87%. Prepare for a mix of chilly and mild days, making it a unique month to experience!

January Temperature in Somerville

In January in Somerville, the average temperature is 7°C (44°F). Maximum temperatures can reach 25°C (77°F), while minimums can be as low as -14°C (8°F). Be prepared for a wide range of temperatures if you're planning to travel 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 7°C (44°F), with highs reaching up to 25°C (77°F) and lows dropping to around -14°C (8°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 114 mm (4.5 in) over the course of 9 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 114 mm (4.5 inches) of precipitation spread over approximately 9 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 87%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring travelers to layer up to stay warm and dry.

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 87%, 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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Somerville for better planning.

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 4, which falls under the moderate 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	7°C (44°F)	114 mm (4.5 inches)	87%	moderate
February Weather	10°C (50°F)	180 mm (7.1 inches)	87%	high
March Weather	13°C (56°F)	190 mm (7.5 inches)	85%	very high
April Weather	16°C (62°F)	148 mm (5.8 inches)	82%	very high
May Weather	22°C (72°F)	103 mm (4.0 inches)	83%	very high
June Weather	25°C (77°F)	138 mm (5.4 inches)	82%	extreme
July Weather	27°C (81°F)	114 mm (4.5 inches)	78%	extreme
August Weather	26°C (80°F)	114 mm (4.5 inches)	67%	very high
September Weather	24°C (76°F)	115 mm (4.5 inches)	64%	very high
October Weather	19°C (66°F)	130 mm (5.1 inches)	74%	high
November Weather	11°C (51°F)	75 mm (2.9 inches)	87%	high
December Weather	9°C (48°F)	157 mm (6.2 inches)	88%	moderate