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December Weather in Worcester, United States

Last updated: June 24, 2025

In December, the average temperature in Worcester, United States hovers around -2°C (29°F), with potential extremes ranging from a chilling -22°C (-7°F) to a mild 16°C (61°F). Expect 92 mm (3.6 in) of precipitation over approximately 13 days, contributing to an average humidity of 84%.

December Temperature in Worcester

In December in Worcester, the average temperature is -2°C (29°F). Maximum temperatures can reach as high as 16°C (61°F), while the minimum can drop as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both chilly days and milder spells.

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

The chart illustrates December temperature patterns in Worcester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Worcester, December typically has an average temperature of -2°C (29°F), with highs reaching up to 16°C (61°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec232732445664706861513629
Data source: Temperature data for Worcester 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 Worcester

In Worcester in December, the precipitation amount is 92 mm (3.6 in) spread over 13 days.

December Precipitation Trends in Worcester

The chart displays monthly precipitation patterns in Worcester, 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 Worcester, December typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec769487114115101117106971449792
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Worcester

In Worcester in December, humidity is 84%. With an average temperature of -2°C (29°F), this humidity feels like an icy blanket that clings to your skin, making it difficult to stay warm and comfortable while traveling.

December Average Humidity in Worcester

This chart illustrates the average monthly humidity levels in Worcester, 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 Worcester is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Worcester

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

Maximum UV Index Levels in Worcester for December

The chart shows the monthly maximum UV Index (UVI) for Worcester 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 Worcester typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Worcester 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 Worcester Compares to Other Months

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

This table compares monthly weather conditions in Worcester, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)76 mm (3.0 inches)89%moderate
February Weather-3°C (27°F)94 mm (3.7 inches)88%moderate
March Weather0°C (33°F)87 mm (3.4 inches)86%high
April Weather7°C (44°F)114 mm (4.5 inches)84%very high
May Weather13°C (56°F)115 mm (4.5 inches)76%very high
June Weather18°C (65°F)101 mm (4.0 inches)72%very high
July Weather21°C (70°F)117 mm (4.6 inches)66%very high
August Weather20°C (68°F)106 mm (4.2 inches)64%very high
September Weather16°C (62°F)97 mm (3.8 inches)72%very high
October Weather11°C (51°F)144 mm (5.7 inches)81%high
November Weather2°C (37°F)97 mm (3.8 inches)87%moderate
December Weather-2°C (29°F)92 mm (3.6 inches)84%low

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