January Weather in Dorchester, United States

Last updated: June 24, 2025

In January, the average temperature in Dorchester, United States hovers around -3°C (27°F), with extreme fluctuations ranging from a frigid -26°C (-14°F) to a mild 16°C (61°F). Expect 32 mm (1.3 in) of precipitation over roughly 4 days, while the average humidity sits comfortably at 76%.

January Temperature in Dorchester

In January in Dorchester, the average temperature is -3°C (27°F), with maximums reaching 16°C (61°F) and minimums dropping as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.

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

The chart illustrates January temperature patterns in Dorchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dorchester, January typically has an average temperature of -3°C (27°F), with highs reaching up to 16°C (61°F) and lows dropping to around -26°C (-14°F).

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

January Precipitation in Dorchester

In Dorchester in January, the total precipitation amount is 32 mm (1.3 in), accumulated over a period of 4 days.

January Precipitation Trends in Dorchester

The chart displays monthly precipitation patterns in Dorchester, 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 Dorchester, January typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 4 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 Dorchester

In Dorchester in January, humidity is 76%. With an average temperature of -3°C (27°F), this humidity feels like a chilly dampness that seeps into your bones, making it essential to bundle up when traveling outdoors.

January Average Humidity in Dorchester

This chart illustrates the average monthly humidity levels in Dorchester, 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 Dorchester is approximately 76%, 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 Dorchester

In Dorchester 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 Dorchester, you can check the information here.

Maximum UV Index Levels in Dorchester for January

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

Data source: Dorchester 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 Dorchester Compares to Other Months

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

This table compares monthly weather conditions in Dorchester, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	32 mm (1.3 inches)	76%	moderate
February Weather	-3°C (27°F)	26 mm (1.0 inches)	80%	moderate
March Weather	6°C (42°F)	95 mm (3.7 inches)	73%	high
April Weather	11°C (51°F)	47 mm (1.8 inches)	74%	very high
May Weather	17°C (63°F)	145 mm (5.7 inches)	78%	very high
June Weather	25°C (77°F)	97 mm (3.8 inches)	82%	extreme
July Weather	26°C (79°F)	64 mm (2.5 inches)	83%	very high
August Weather	24°C (76°F)	82 mm (3.2 inches)	80%	very high
September Weather	21°C (70°F)	81 mm (3.2 inches)	75%	very high
October Weather	12°C (53°F)	110 mm (4.3 inches)	75%	high
November Weather	5°C (41°F)	27 mm (1.1 inches)	82%	moderate
December Weather	0°C (33°F)	40 mm (1.6 inches)	83%	moderate