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December Weather in Bethesda, United Kingdom

Last updated: August 27, 2025

In Bethesda, United Kingdom, the average temperature in December hovers around 6°C (44°F). Expect chilly nights, with minimum temperatures dipping to -3°C (26°F), while daytime highs can reach up to 13°C (56°F). You'll want to come prepared for rain, as 128 mm (5.0 in) of precipitation is recorded over approximately 20 days. With an average humidity level of 89%, it feels quite damp, so layering is key for comfort!

December Temperature in Bethesda

In December in Bethesda, the average temperature is 6°C (44°F). Maximum temperatures can reach 13°C (56°F), while minimum temperatures can drop to a chilly -3°C (26°F). Visitors should be prepared for a mix of cool and mild weather during their travels.

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

The chart illustrates December temperature patterns in Bethesda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethesda, December typically has an average temperature of 6°C (44°F), with highs reaching up to 13°C (56°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344475258616056524643
Data source: Temperature data for Bethesda 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 Bethesda

In Bethesda in December, the total precipitation amount is 128 mm (5.0 in) spread over 20 days.

December Precipitation Trends in Bethesda

The chart displays monthly precipitation patterns in Bethesda, 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 Bethesda, December typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec7810310558789893109101122103128
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bethesda

In Bethesda in December, humidity is 89%. With an average temperature of 6°C (44°F), this humidity feels like an uncomfortable chill that clings to your skin, making it difficult to enjoy outdoor activities and ideal for layered clothing.

December Average Humidity in Bethesda

This chart illustrates the average monthly humidity levels in Bethesda, 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 Bethesda is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bethesda

In Bethesda in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Bethesda.

Maximum UV Index Levels in Bethesda for December

The chart shows the monthly maximum UV Index (UVI) for Bethesda 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 Bethesda typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Bethesda 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 Bethesda Compares to Other Months

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

This table compares monthly weather conditions in Bethesda, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)78 mm (3.1 inches)89%low
February Weather6°C (43°F)103 mm (4.1 inches)88%low
March Weather7°C (44°F)105 mm (4.1 inches)86%moderate
April Weather9°C (48°F)58 mm (2.3 inches)84%moderate
May Weather11°C (53°F)78 mm (3.1 inches)79%high
June Weather15°C (58°F)98 mm (3.8 inches)81%very high
July Weather16°C (61°F)93 mm (3.7 inches)78%very high
August Weather15°C (60°F)109 mm (4.3 inches)79%high
September Weather14°C (57°F)100 mm (4.0 inches)85%moderate
October Weather11°C (52°F)122 mm (4.8 inches)90%moderate
November Weather8°C (46°F)103 mm (4.1 inches)91%low
December Weather6°C (44°F)128 mm (5.0 inches)89%low

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