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December Weather in Trelly, France

Last updated: August 23, 2025

In December, the average temperature in Trelly, France hovers around 9°C (48°F), with a minimum dip to 0°C (33°F) and a peak reaching up to 14°C (57°F). Expect 176 mm (6.9 in) of precipitation over approximately 20 days, contributing to an average humidity level of 92%. Remember to pack your waterproof gear!

December Temperature in Trelly

In December in Trelly, the average temperature is 9°C (48°F). Maximums can reach 14°C (57°F), and minimums can be as low as 0°C (33°F). Be sure to pack layers to stay comfortable while exploring the area!

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

The chart illustrates December temperature patterns in Trelly, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trelly, December typically has an average temperature of 9°C (48°F), with highs reaching up to 14°C (57°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec454648515661656462575047
Data source: Temperature data for Trelly 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 Trelly

In Trelly in December, the precipitation amount is 176 mm (6.9 in) spread over the course of 20 days.

December Precipitation Trends in Trelly

The chart displays monthly precipitation patterns in Trelly, 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 Trelly, December typically receives around 176 mm (6.9 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec979391428281627885146115176
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Trelly

In Trelly in December humidity is 92%. With an average temperature of 9°C (48°F), this humidity feels like a heavy blanket enveloping you, making outdoor exploration quite challenging due to the stickiness in the air and the constant dampness that clings to your skin.

December Average Humidity in Trelly

This chart illustrates the average monthly humidity levels in Trelly, 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 Trelly is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%86%85%80%80%69%73%79%89%92%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Trelly

In Trelly 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 Trelly.

Maximum UV Index Levels in Trelly for December

The chart shows the monthly maximum UV Index (UVI) for Trelly 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 Trelly typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234679886421
Data source: Trelly 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 Trelly Compares to Other Months

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

This table compares monthly weather conditions in Trelly, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)96 mm (3.8 inches)90%low
February Weather8°C (46°F)93 mm (3.7 inches)89%moderate
March Weather9°C (48°F)91 mm (3.6 inches)86%moderate
April Weather11°C (51°F)42 mm (1.7 inches)84%high
May Weather13°C (56°F)82 mm (3.2 inches)80%high
June Weather16°C (62°F)81 mm (3.2 inches)80%very high
July Weather18°C (65°F)62 mm (2.4 inches)69%very high
August Weather18°C (65°F)77 mm (3.1 inches)73%very high
September Weather17°C (62°F)85 mm (3.3 inches)79%high
October Weather14°C (57°F)146 mm (5.7 inches)89%moderate
November Weather10°C (51°F)115 mm (4.5 inches)92%low
December Weather9°C (48°F)176 mm (6.9 inches)92%low

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