Last updated: August 27, 2025
In December, the average temperature in Cwm, United Kingdom hovers around 6°C (44°F). Expect chilly nights with minimums plunging to -4°C (26°F), while daytime highs can reach up to 13°C (56°F). The weather brings an average of 106 mm (4.2 in) of precipitation over 17 days, creating a damp atmosphere with an average humidity of 89%.
In December in Cwm, the average temperature is 6°C (44°F). Maximum temperatures can reach 13°C (56°F), while minimums can dip as low as -4°C (26°F). Be prepared for a chilly climate if you plan to travel during this time!
In Cwm in December, the precipitation amount is 106 mm (4.2 in) spread over 17 days.
In Cwm 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.
In Cwm 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 Cwm.
UV Risk Categories
Weather in Cwm varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Cwm, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (42°F) | 66 mm (2.6 inches) | 89% | low |
| February Weather | 6°C (43°F) | 83 mm (3.3 inches) | 88% | low |
| March Weather | 7°C (45°F) | 88 mm (3.5 inches) | 86% | moderate |
| April Weather | 9°C (48°F) | 54 mm (2.1 inches) | 84% | moderate |
| May Weather | 12°C (53°F) | 67 mm (2.6 inches) | 79% | high |
| June Weather | 15°C (59°F) | 98 mm (3.9 inches) | 81% | very high |
| July Weather | 16°C (62°F) | 92 mm (3.6 inches) | 78% | very high |
| August Weather | 16°C (61°F) | 91 mm (3.6 inches) | 79% | high |
| September Weather | 14°C (57°F) | 93 mm (3.7 inches) | 85% | moderate |
| October Weather | 11°C (52°F) | 97 mm (3.8 inches) | 90% | moderate |
| November Weather | 8°C (47°F) | 82 mm (3.2 inches) | 91% | low |
| December Weather | 6°C (44°F) | 106 mm (4.2 inches) | 89% | low |