December Weather in Millbury, United States

Last updated: June 24, 2025

In December, the average temperature in Millbury, United States hovers around 0°C (33°F), with minimums plummeting to -20°C (-5°F) and maximums reaching a mild 17°C (62°F). Expect about 123 mm (4.9 in) of precipitation spread over 10 days, contributing to an average humidity of 81%, making for a notably chilly and damp month.

December Temperature in Millbury

In December in Millbury, the average temperature is 0°C (33°F). The maximum can reach 17°C (62°F), while the minimum can drop as low as -20°C (-5°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to enjoy their visit.

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

The chart illustrates December temperature patterns in Millbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Millbury, December typically has an average temperature of 0°C (33°F), with highs reaching up to 17°C (62°F) and lows dropping to around -20°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec293237475868737265554133
Data source: Temperature data for Millbury 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 Millbury

In Millbury in December, the total precipitation amount is 123 mm (4.9 in) over the course of 10 days.

December Precipitation Trends in Millbury

The chart displays monthly precipitation patterns in Millbury, 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 Millbury, December typically receives around 123 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec728890130949515010193141101124
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Millbury

In Millbury 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 Millbury

This chart illustrates the average monthly humidity levels in Millbury, 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 Millbury 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 Millbury

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

Maximum UV Index Levels in Millbury for December

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

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

This table compares monthly weather conditions in Millbury, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)72 mm (2.8 inches)86%moderate
February Weather0°C (32°F)88 mm (3.5 inches)84%moderate
March Weather3°C (37°F)90 mm (3.5 inches)82%high
April Weather9°C (48°F)130 mm (5.1 inches)80%very high
May Weather14°C (58°F)94 mm (3.7 inches)72%very high
June Weather20°C (68°F)95 mm (3.7 inches)72%very high
July Weather23°C (74°F)150 mm (5.9 inches)67%very high
August Weather22°C (73°F)101 mm (4.0 inches)66%very high
September Weather19°C (66°F)93 mm (3.7 inches)71%high
October Weather13°C (55°F)141 mm (5.5 inches)78%high
November Weather5°C (42°F)101 mm (4.0 inches)84%moderate
December Weather0°C (33°F)123 mm (4.9 inches)81%low

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