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December Weather in Llanelli, United Kingdom

Last updated: August 27, 2025

In December, the average temperature in Llanelli, United Kingdom is a crisp 8°C (46°F). Expect a minimum chill of 0°C (32°F) and a pleasant maximum of 13°C (55°F). During this time, 184 mm (7.2 in) of precipitation typically falls over 20 days, contributing to the region's average humidity of 89%. Prepare for a wet and cool experience!

December Temperature in Llanelli

In December in Llanelli, the average temperature is 8°C (46°F). Maximums can reach 13°C (55°F) and minimums can be as low as 0°C (32°F). Be sure to pack warm clothing, as chilly conditions may prevail during your travels.

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

The chart illustrates December temperature patterns in Llanelli, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Llanelli, December typically has an average temperature of 8°C (46°F), with highs reaching up to 13°C (55°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec434445485359626158544846
Data source: Temperature data for Llanelli 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 Llanelli

In Llanelli in December, the total precipitation amount is 184 mm (7.2 in) during a span of 20 days.

December Precipitation Trends in Llanelli

The chart displays monthly precipitation patterns in Llanelli, 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 Llanelli, December typically receives around 184 mm (7.2 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec99136115619010091134115171151184
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Llanelli

In Llanelli in December humidity is 89%. With an average temperature of 8°C (46°F), this humidity feels like a chilly dampness that clings to your skin, making travel uncomfortable and necessitating extra layers to stay warm while you navigate the wet conditions.

December Average Humidity in Llanelli

This chart illustrates the average monthly humidity levels in Llanelli, 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 Llanelli is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Llanelli

In Llanelli 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 Llanelli.

Maximum UV Index Levels in Llanelli for December

The chart shows the monthly maximum UV Index (UVI) for Llanelli 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 Llanelli typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Llanelli 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 Llanelli Compares to Other Months

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

This table compares monthly weather conditions in Llanelli, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)99 mm (3.9 inches)88%low
February Weather7°C (44°F)136 mm (5.3 inches)88%low
March Weather7°C (45°F)115 mm (4.5 inches)86%moderate
April Weather9°C (49°F)61 mm (2.4 inches)84%high
May Weather12°C (53°F)90 mm (3.5 inches)80%high
June Weather15°C (59°F)100 mm (3.9 inches)80%very high
July Weather16°C (62°F)91 mm (3.6 inches)70%very high
August Weather16°C (61°F)134 mm (5.3 inches)73%high
September Weather15°C (58°F)115 mm (4.5 inches)79%high
October Weather12°C (54°F)171 mm (6.7 inches)89%moderate
November Weather9°C (49°F)151 mm (6.0 inches)90%low
December Weather8°C (46°F)184 mm (7.2 inches)89%low

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