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December Weather in Bristol, United States

Last updated: June 24, 2025

In December, the average temperature in Bristol, United States hovers around 6°C (42°F), with a chilly minimum plummeting to -11°C (12°F) and a pleasant maximum reaching 21°C (70°F). Expect 123 mm (4.8 in) of precipitation across 13 days, contributing to a high average humidity of 86%. Embrace the season's variety as you explore the landscape!

December Temperature in Bristol

In December in Bristol, the average temperature is 6°C (42°F). Maximum temperatures can reach 21°C (70°F), while the minimum can drop as low as -11°C (12°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates December temperature patterns in Bristol, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bristol, December typically has an average temperature of 6°C (42°F), with highs reaching up to 21°C (70°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec384449566571757470604642
Data source: Temperature data for Bristol 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 Bristol

In Bristol in December, the precipitation amount is 123 mm (4.8 in) over the course of 13 days.

December Precipitation Trends in Bristol

The chart displays monthly precipitation patterns in Bristol, 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 Bristol, December typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec971451241291069671868011078123
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bristol

In Bristol in December, humidity is 86%. With an average temperature of 6°C (42°F), this humidity feels like a chilly, damp embrace that can make outdoor activities feel uncomfortable and chilly, prompting travelers to seek shelter or warm clothing to stay cozy while exploring.

December Average Humidity in Bristol

This chart illustrates the average monthly humidity levels in Bristol, 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 Bristol is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bristol

In Bristol in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Bristol, you can check the information here.

Maximum UV Index Levels in Bristol for December

The chart shows the monthly maximum UV Index (UVI) for Bristol 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 Bristol typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010853
Data source: Bristol 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 Bristol Compares to Other Months

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

This table compares monthly weather conditions in Bristol, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (39°F)97 mm (3.8 inches)87%moderate
February Weather7°C (44°F)145 mm (5.7 inches)87%high
March Weather9°C (49°F)124 mm (4.9 inches)86%very high
April Weather13°C (56°F)129 mm (5.1 inches)84%very high
May Weather18°C (66°F)106 mm (4.2 inches)83%extreme
June Weather22°C (71°F)96 mm (3.8 inches)83%extreme
July Weather24°C (76°F)71 mm (2.8 inches)79%extreme
August Weather23°C (74°F)86 mm (3.4 inches)66%very high
September Weather21°C (70°F)80 mm (3.1 inches)68%very high
October Weather16°C (60°F)110 mm (4.3 inches)78%very high
November Weather8°C (46°F)78 mm (3.1 inches)89%moderate
December Weather6°C (42°F)123 mm (4.8 inches)86%moderate

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