Last updated: August 23, 2025
In December, the average temperature in Lannion, France hovers around 10°C (50°F), with nighttime lows dipping to a comfortable 3°C (38°F) and daytime highs reaching up to 14°C (57°F). Expect a total precipitation of 167 mm (6.6 in) spread over approximately 21 days, accompanied by a high average humidity of 90%, creating a distinctly fresh and damp atmosphere.
In December in Lannion, the average temperature is 10°C (50°F). The maximum can reach 14°C (57°F), while the minimum can drop as low as 3°C (38°F). It's a great time to visit Lannion if you enjoy cool, crisp weather and want to explore without the summer crowds.
In Lannion in December, the precipitation amount is 167 mm (6.6 in) over the course of 21 days.
In Lannion in December humidity is 90%. With an average temperature of 10°C (50°F), this humidity feels like a chilly, damp blanket enveloping you, making traveling uncomfortable as the cool air mixed with high moisture can lead to persistent chilliness and a constant sense of being wet, even while walking around.
In Lannion 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 Lannion.
UV Risk Categories
Weather in Lannion varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lannion, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (47°F) | 97 mm (3.8 inches) | 89% | low |
| February Weather | 8°C (48°F) | 96 mm (3.8 inches) | 88% | moderate |
| March Weather | 9°C (49°F) | 78 mm (3.1 inches) | 85% | moderate |
| April Weather | 10°C (51°F) | 50 mm (2.0 inches) | 84% | high |
| May Weather | 12°C (55°F) | 68 mm (2.7 inches) | 81% | very high |
| June Weather | 15°C (59°F) | 75 mm (2.9 inches) | 77% | very high |
| July Weather | 17°C (62°F) | 44 mm (1.7 inches) | 63% | very high |
| August Weather | 17°C (63°F) | 47 mm (1.9 inches) | 71% | very high |
| September Weather | 16°C (61°F) | 57 mm (2.3 inches) | 76% | high |
| October Weather | 14°C (57°F) | 142 mm (5.6 inches) | 89% | moderate |
| November Weather | 11°C (52°F) | 109 mm (4.3 inches) | 90% | low |
| December Weather | 10°C (50°F) | 167 mm (6.6 inches) | 90% | low |