Last updated: August 23, 2025
In December, the average temperature in Lannilis, France is a cool 10°C (50°F). Expect minimums to dip to 2°C (37°F) and highs reaching up to 14°C (57°F). With an average humidity of 90%, the air can feel quite damp. Be prepared for around 140 mm (5.5 in) of precipitation spread over 18 days, making for a rather wet month.
In December in Lannilis, the average temperature is 10°C (50°F), with maximums reaching 14°C (57°F) and minimums dropping to 2°C (37°F). This mild climate makes Lannilis an ideal destination for travelers looking to enjoy cool yet comfortable weather.
In Lannilis in December, the precipitation amount is 140 mm (5.5 in) over the course of 18 days.
In Lannilis 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 Lannilis in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Lannilis, you can visit Hourly UV Index in Lannilis.
UV Risk Categories
Weather in Lannilis varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lannilis, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (47°F) | 81 mm (3.2 inches) | 89% | low |
| February Weather | 9°C (48°F) | 98 mm (3.9 inches) | 88% | moderate |
| March Weather | 9°C (49°F) | 76 mm (3.0 inches) | 85% | moderate |
| April Weather | 11°C (51°F) | 44 mm (1.7 inches) | 84% | high |
| May Weather | 13°C (55°F) | 57 mm (2.3 inches) | 81% | very high |
| June Weather | 15°C (60°F) | 75 mm (3.0 inches) | 77% | very high |
| July Weather | 17°C (63°F) | 46 mm (1.8 inches) | 63% | very high |
| August Weather | 17°C (62°F) | 59 mm (2.3 inches) | 71% | very high |
| September Weather | 16°C (60°F) | 51 mm (2.0 inches) | 76% | high |
| October Weather | 13°C (56°F) | 114 mm (4.5 inches) | 89% | moderate |
| November Weather | 11°C (52°F) | 99 mm (3.9 inches) | 90% | low |
| December Weather | 10°C (50°F) | 140 mm (5.5 inches) | 90% | low |