Last updated: August 23, 2025
In December, the average temperature in Mersch, Luxembourg hovers around 4°C (39°F), with extremes ranging from a brisk -5°C (23°F) to a mild 14°C (57°F). Expect a significant precipitation amount of 122 mm (4.8 in) spread over 19 days, contributing to an average humidity of 93%—perfect for cozy days indoors!
In December in Mersch, the average temperature is 4°C (39°F). The maximum can reach 14°C (57°F), and the minimum can be as low as -5°C (23°F). It's a good idea to pack warm layers and prepare for varying weather conditions while traveling to Mersch.
In Mersch in December, the precipitation amount is 122 mm (4.8 in) over a span of 19 days.
In Mersch in December, humidity is 93%. With an average temperature of 4°C (39°F), this humidity feels like a damp, chilly blanket that clings to your skin, making outdoor exploration uncomfortable and necessitating extra layers to stay warm and dry.
In Mersch 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 Mersch.
UV Risk Categories
Weather in Mersch varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mersch, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (36°F) | 72 mm (2.8 inches) | 91% | low |
| February Weather | 3°C (38°F) | 75 mm (3.0 inches) | 90% | moderate |
| March Weather | 6°C (43°F) | 83 mm (3.2 inches) | 88% | moderate |
| April Weather | 9°C (49°F) | 41 mm (1.6 inches) | 84% | high |
| May Weather | 13°C (55°F) | 74 mm (2.9 inches) | 81% | very high |
| June Weather | 17°C (64°F) | 77 mm (3.0 inches) | 82% | very high |
| July Weather | 18°C (65°F) | 73 mm (2.9 inches) | 82% | very high |
| August Weather | 18°C (65°F) | 66 mm (2.6 inches) | 80% | very high |
| September Weather | 14°C (58°F) | 64 mm (2.5 inches) | 83% | high |
| October Weather | 10°C (51°F) | 80 mm (3.2 inches) | 89% | moderate |
| November Weather | 5°C (42°F) | 69 mm (2.7 inches) | 91% | low |
| December Weather | 4°C (39°F) | 122 mm (4.8 inches) | 93% | low |