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December Weather in Merton, United Kingdom

Last updated: August 27, 2025

In Merton, United Kingdom, the average temperature in December hovers around 8°C (46°F), with minimums dipping to 0°C (32°F) and maximums reaching 13°C (57°F). Expect a precipitation amount of about 122 mm (4.8 in) spread across 19 days, accompanied by an average humidity level of 89%. Stay prepared for a wet and chilly month!

December Temperature in Merton

In December in Merton, the average temperature is 8°C (46°F). The maximum can reach 13°C (57°F), and the minimum can be as low as 0°C (32°F). It's a great time for travelers to pack layers and enjoy the crisp air while exploring the sights.

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

The chart illustrates December temperature patterns in Merton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merton, December typically has an average temperature of 8°C (46°F), with highs reaching up to 13°C (57°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec434445485359616158534846
Data source: Temperature data for Merton 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 Merton

In Merton in December, the precipitation amount is 122 mm (4.8 in) over a span of 19 days.

December Precipitation Trends in Merton

The chart displays monthly precipitation patterns in Merton, 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 Merton, December typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec70808851688375827510790122
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Merton

In Merton 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 Merton

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

In Merton 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 Merton.

Maximum UV Index Levels in Merton for December

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

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

This table compares monthly weather conditions in Merton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)70 mm (2.7 inches)88%low
February Weather7°C (44°F)80 mm (3.2 inches)88%low
March Weather7°C (45°F)88 mm (3.5 inches)86%moderate
April Weather9°C (49°F)51 mm (2.0 inches)84%high
May Weather11°C (53°F)68 mm (2.7 inches)80%high
June Weather15°C (59°F)83 mm (3.3 inches)80%very high
July Weather16°C (62°F)75 mm (3.0 inches)70%very high
August Weather16°C (61°F)82 mm (3.2 inches)73%high
September Weather14°C (58°F)75 mm (2.9 inches)79%high
October Weather12°C (53°F)107 mm (4.2 inches)89%moderate
November Weather9°C (48°F)90 mm (3.6 inches)90%low
December Weather8°C (46°F)122 mm (4.8 inches)89%low

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