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January Weather in Dorchester, United States

Last updated: June 24, 2025

In January, the average temperature in Dorchester, United States hovers around -9°C (16°F). Expect chilly nights with minimums plunging to -33°C (-27°F), while the daytime can reach up to a maximum of 7°C (44°F). Precipitation is modest, with approximately 34 mm (1.3 in) expected over 6 days, and an average humidity level of 88%, creating a crisp, frosty atmosphere.

January Temperature in Dorchester

In January in Dorchester, the average temperature is -9°C (16°F), with a maximum reaching up to 7°C (44°F) and a minimum plunging as low as -33°C (-27°F). Travelers should be prepared for extremely cold conditions and ensure they pack warm clothing to enjoy their visit.

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 -9°C (16°F), with highs reaching up to 7°C (44°F) and lows dropping to around -33°C (-27°F).
JanFebMarAprMayJunJulAugSepOctNovDec161631415667716761463222
Data source: Temperature data for Dorchester 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 Dorchester

In Dorchester in January, the total precipitation amount is 34 mm (1.3 in) spread over 6 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 34 mm (1.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec34525498118107127133901205154
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Dorchester

In Dorchester in January humidity is 88%. With an average temperature of -9°C (16°F), this humidity feels like a biting cold that seeps into your bones, making travel outside feel much more daunting and uncomfortable, as each breath turns into a cloud of mist in the frigid air.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
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 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 Dorchester, you can visit Hourly UV Index in Dorchester.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810997532
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.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)34 mm (1.3 inches)88%low
February Weather-9°C (17°F)52 mm (2.1 inches)89%moderate
March Weather-1°C (31°F)54 mm (2.1 inches)86%moderate
April Weather5°C (42°F)98 mm (3.9 inches)85%high
May Weather14°C (57°F)118 mm (4.7 inches)79%very high
June Weather19°C (67°F)107 mm (4.2 inches)80%very high
July Weather22°C (71°F)127 mm (5.0 inches)80%very high
August Weather19°C (67°F)133 mm (5.3 inches)78%very high
September Weather16°C (61°F)90 mm (3.5 inches)80%high
October Weather8°C (47°F)120 mm (4.7 inches)84%moderate
November Weather0°C (32°F)51 mm (2.0 inches)89%moderate
December Weather-5°C (23°F)54 mm (2.1 inches)85%low

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