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January Weather in Somerville, United States

Last updated: June 24, 2025

In January, the average temperature in Somerville, United States is a pleasant 12°C (53°F). Visitors can experience a range in temperatures, with a minimum of -9°C (16°F) and a maximum of 29°C (84°F). During this month, expect 70 mm (2.8 in) of precipitation spread over 8 days, and a notable average humidity of 79%.

January Temperature in Somerville

In January in Somerville, the average temperature is 12°C (53°F). Maximum temperatures can reach 29°C (84°F), while minimums can drop as low as -9°C (16°F). Travelers should be prepared for a wide range of temperatures when visiting Somerville 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 12°C (53°F), with highs reaching up to 29°C (84°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec535564697782848681726156
Data source: Temperature data for Somerville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Somerville

In Somerville in January, the total precipitation amount is 70 mm (2.8 in), spread 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 70 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec708170111166118961201259572103
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Somerville

In Somerville in January, humidity is 79%. With an average temperature of 12°C (53°F), this humidity feels like a damp blanket enveloping you, making outdoor activities slightly uncomfortable and ideal for cozy indoor explorations rather than extensive sightseeing.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
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 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the 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 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121111865
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.
 TemperaturePrecipitationHumidityUV
January Weather12°C (53°F)70 mm (2.8 inches)79%moderate
February Weather13°C (55°F)81 mm (3.2 inches)80%very high
March Weather18°C (65°F)69 mm (2.7 inches)78%very high
April Weather20°C (69°F)111 mm (4.4 inches)79%extreme
May Weather25°C (77°F)166 mm (6.5 inches)81%extreme
June Weather28°C (83°F)118 mm (4.7 inches)77%extreme
July Weather29°C (85°F)96 mm (3.8 inches)71%extreme
August Weather30°C (86°F)120 mm (4.7 inches)67%extreme
September Weather27°C (81°F)125 mm (4.9 inches)69%extreme
October Weather22°C (72°F)95 mm (3.7 inches)73%very high
November Weather16°C (61°F)72 mm (2.8 inches)82%high
December Weather13°C (56°F)103 mm (4.0 inches)87%moderate

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