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December Weather in Dorchester, Canada

Last updated: June 18, 2025

In Dorchester, Canada, the average temperature in December hovers around -1°C (31°F). Expect lows of -22°C (-8°F) and highs reaching up to 15°C (59°F). This month also brings 74 mm (2.9 in) of precipitation over 13 days, with an average humidity of 87%. Be prepared for a chilly, damp atmosphere!

December Temperature in Dorchester

In December in Dorchester, the average temperature is -1°C (31°F), with maximums reaching 15°C (59°F) and minimums dropping as low as -22°C (-8°F). Visitors should be prepared for a wide range of temperatures and pack accordingly for their trip.

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 -1°C (31°F), with highs reaching up to 15°C (59°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec252634435666727063523831
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 precipitation amount is 74 mm (2.9 in) over the course of 13 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 74 mm (2.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec7679781091021049596831208774
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 87%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through your clothes, making traveling incredibly uncomfortable as it adds a layer of dampness to the already cold air, leaving you shivering and wishing for warmth.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%88%87%83%81%79%80%81%84%88%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec24589101098542
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-4°C (25°F)76 mm (3.0 inches)90%low
February Weather-3°C (26°F)79 mm (3.1 inches)90%moderate
March Weather1°C (34°F)78 mm (3.1 inches)87%moderate
April Weather6°C (44°F)109 mm (4.3 inches)87%very high
May Weather14°C (57°F)102 mm (4.0 inches)82%very high
June Weather19°C (67°F)104 mm (4.1 inches)81%very high
July Weather22°C (72°F)95 mm (3.7 inches)79%very high
August Weather21°C (70°F)96 mm (3.8 inches)80%very high
September Weather17°C (63°F)83 mm (3.2 inches)81%very high
October Weather11°C (52°F)120 mm (4.7 inches)84%moderate
November Weather3°C (38°F)87 mm (3.4 inches)88%moderate
December Weather-1°C (31°F)74 mm (2.9 inches)87%low

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