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December Weather in Mostyn, United Kingdom

Last updated: August 27, 2025

In December, the average temperature in Mostyn, United Kingdom hovers around 6°C (44°F), with lows plummeting to -4°C (26°F) and highs reaching up to 14°C (57°F). You can expect about 100 mm (4.0 in) of precipitation spread over 17 days, contributing to a notably high average humidity of 89%.

December Temperature in Mostyn

In December in Mostyn, the average temperature is 6°C (44°F). The maximum can reach 14°C (57°F), while the minimum can drop as low as -4°C (26°F). This range suggests that travelers should pack warm layers for their visit.

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

The chart illustrates December temperature patterns in Mostyn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mostyn, December typically has an average temperature of 6°C (44°F), with highs reaching up to 14°C (57°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec424345485459626157524643
Data source: Temperature data for Mostyn 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 Mostyn

In Mostyn in December, the precipitation amount is 100 mm (4.0 in) over a span of 17 days.

December Precipitation Trends in Mostyn

The chart displays monthly precipitation patterns in Mostyn, 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 Mostyn, December typically receives around 100 mm (4.0 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec6577845368949698949478101
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mostyn

In Mostyn 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 Mostyn

This chart illustrates the average monthly humidity levels in Mostyn, 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 Mostyn 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 Mostyn

In Mostyn 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 Mostyn.

Maximum UV Index Levels in Mostyn for December

The chart shows the monthly maximum UV Index (UVI) for Mostyn 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 Mostyn typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578875421
Data source: Mostyn 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 Mostyn Compares to Other Months

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

This table compares monthly weather conditions in Mostyn, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)65 mm (2.6 inches)89%low
February Weather6°C (43°F)77 mm (3.0 inches)88%low
March Weather7°C (45°F)84 mm (3.3 inches)86%moderate
April Weather9°C (48°F)53 mm (2.1 inches)84%moderate
May Weather12°C (54°F)68 mm (2.7 inches)79%high
June Weather15°C (60°F)94 mm (3.7 inches)81%very high
July Weather17°C (62°F)96 mm (3.8 inches)78%very high
August Weather16°C (61°F)98 mm (3.9 inches)79%high
September Weather14°C (57°F)94 mm (3.7 inches)85%moderate
October Weather11°C (52°F)94 mm (3.7 inches)90%moderate
November Weather8°C (47°F)78 mm (3.1 inches)91%low
December Weather6°C (44°F)100 mm (4.0 inches)89%low

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