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December Weather in Sudbury, United States

Last updated: June 24, 2025

In December, the average temperature in Sudbury, United States is a chilly 0°C (33°F). Expect minimum temperatures to plunge as low as -22°C (-7°F), while the highs can reach up to 17°C (63°F). This month also brings 118 mm (4.6 in) of precipitation over about 10 days, contributing to an average humidity of 81%. Prepare accordingly for a mix of cold and wet weather!

December Temperature in Sudbury

In December in Sudbury, the average temperature is 0°C (33°F). Maximums can reach 17°C (63°F), and minimums can be as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to ensure comfort during their visit.

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

The chart illustrates December temperature patterns in Sudbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sudbury, December typically has an average temperature of 0°C (33°F), with highs reaching up to 17°C (63°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec303237485969747366554233
Data source: Temperature data for Sudbury 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 Sudbury

In Sudbury in December, the total precipitation amount is 118 mm (4.6 in) over a span of 10 days.

December Precipitation Trends in Sudbury

The chart displays monthly precipitation patterns in Sudbury, 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 Sudbury, December typically receives around 118 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6985861248685133857913297118
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sudbury

In Sudbury in December, humidity is 81%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill enveloping you, making travel uncomfortable and the air heavy, leaving you craving warmth and dry conditions.

December Average Humidity in Sudbury

This chart illustrates the average monthly humidity levels in Sudbury, 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 Sudbury is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sudbury

In Sudbury 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 Sudbury, you can visit Hourly UV Index in Sudbury.

Maximum UV Index Levels in Sudbury for December

The chart shows the monthly maximum UV Index (UVI) for Sudbury 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 Sudbury typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910997642
Data source: Sudbury 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 Sudbury Compares to Other Months

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

This table compares monthly weather conditions in Sudbury, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)69 mm (2.7 inches)86%moderate
February Weather0°C (32°F)85 mm (3.3 inches)84%moderate
March Weather3°C (38°F)86 mm (3.4 inches)82%high
April Weather9°C (48°F)124 mm (4.9 inches)80%very high
May Weather15°C (59°F)86 mm (3.4 inches)72%very high
June Weather20°C (69°F)85 mm (3.4 inches)72%very high
July Weather23°C (74°F)133 mm (5.3 inches)67%very high
August Weather23°C (73°F)85 mm (3.4 inches)66%very high
September Weather19°C (66°F)79 mm (3.1 inches)71%high
October Weather13°C (55°F)132 mm (5.2 inches)78%high
November Weather5°C (42°F)97 mm (3.8 inches)84%moderate
December Weather0°C (33°F)118 mm (4.6 inches)81%low

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