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December Weather in Dorchester, United States

Last updated: June 24, 2025

In Dorchester, United States, the average temperature in December hovers around -5°C (23°F), with a chilling minimum of -31°C (-24°F) and occasional highs reaching 15°C (59°F). During this month, expect 54 mm (2.1 in) of precipitation spread across 8 days, creating a damp atmosphere with an average humidity of 85%.

December Temperature in Dorchester

In December in Dorchester, the average temperature is -5°C (23°F), with a maximum that can reach 15°C (59°F) and a minimum that can plummet to -31°C (-24°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and milder conditions.

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

The chart illustrates December 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, December typically has an average temperature of -5°C (23°F), with highs reaching up to 15°C (59°F) and lows dropping to around -31°C (-24°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.

December Precipitation in Dorchester

In Dorchester in December, the total precipitation amount reaches 54 mm (2.1 in) over a span of 8 days.

December Precipitation Trends in Dorchester

The chart displays monthly precipitation patterns in Dorchester, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Dorchester, December typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec34525498118107127133901205154
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Dorchester

In Dorchester in December, humidity is 85%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that clings to your skin, making even the briefest outdoor excursions feel daunting and uncomfortable.

December Average Humidity in Dorchester

This chart illustrates the average monthly humidity levels in Dorchester, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Dorchester is approximately 85%, 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 December generated using information from the Copernicus Climate Change Service.

December UV Index in Dorchester

In Dorchester in December, 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 December

The chart shows the monthly maximum UV Index (UVI) for Dorchester in December, 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 December, the maximum UV index in Dorchester typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810997532
Data source: Dorchester December 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 December 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 December’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 December’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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