Last updated: August 27, 2025
In December, the average temperature in Llanellen, United Kingdom hovers around 6°C (43°F), with minimums dipping to a chilly -8°C (17°F) and maximums reaching a mild 13°C (56°F). Expect frequent showers, as precipitation averages 108 mm (4.3 in) over 16 days, accompanied by high humidity levels of 89%. Prepare for a cool, damp month that will keep you cozy indoors!
In December in Llanellen, the average temperature is 6°C (43°F). Maximum temperatures can reach 13°C (56°F), while minimums can drop as low as -8°C (17°F). Be sure to pack warm clothing if you plan to visit during this chilly month.
In Llanellen in December, the total precipitation amount is 108 mm (4.3 in), which falls over the course of 16 days.
In Llanellen in December, humidity is 89%. With an average temperature of 6°C (43°F), this humidity feels like a chilly, damp embrace that can make outdoor activities uncomfortable and energy-draining, often leading travelers to seek shelter indoors or dress in layers to cope with the cold and moist air.
In Llanellen 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 Llanellen.
UV Risk Categories
Weather in Llanellen varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Llanellen, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 61 mm (2.4 inches) | 88% | low |
| February Weather | 6°C (42°F) | 84 mm (3.3 inches) | 88% | low |
| March Weather | 7°C (44°F) | 88 mm (3.5 inches) | 86% | moderate |
| April Weather | 9°C (48°F) | 58 mm (2.3 inches) | 84% | high |
| May Weather | 12°C (53°F) | 79 mm (3.1 inches) | 80% | high |
| June Weather | 15°C (60°F) | 82 mm (3.2 inches) | 80% | very high |
| July Weather | 17°C (63°F) | 73 mm (2.9 inches) | 70% | very high |
| August Weather | 16°C (61°F) | 84 mm (3.3 inches) | 73% | high |
| September Weather | 14°C (57°F) | 63 mm (2.5 inches) | 79% | high |
| October Weather | 11°C (52°F) | 111 mm (4.4 inches) | 89% | moderate |
| November Weather | 8°C (46°F) | 84 mm (3.3 inches) | 90% | low |
| December Weather | 6°C (43°F) | 108 mm (4.3 inches) | 89% | low |