Last updated: August 23, 2025
In Illiat, France, the average temperature in December hovers around 6°C (42°F). Expect temperatures to range from a chilly -4°C (25°F) to a mild 17°C (62°F). The region experiences an average precipitation of 150 mm (5.9 in) over 18 days, leading to a high average humidity of 93%. Prepare accordingly for a damp and cool month!
In December in Illiat, the average temperature is 6°C (42°F). The maximum can reach 17°C (62°F), while the minimum can dip as low as -4°C (25°F). Be sure to pack layers to stay comfortable during your travels, as temperatures can vary significantly throughout the day.
In Illiat in December, the precipitation amount is 150 mm (5.9 in) over the course of 18 days.
In Illiat in December, humidity is 93%. With an average temperature of 6°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and necessitating extra layers to stay warm and dry while traveling.
In Illiat 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 Illiat, you can visit Hourly UV Index in Illiat.
UV Risk Categories
Weather in Illiat varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Illiat, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 86 mm (3.4 inches) | 91% | low |
| February Weather | 7°C (44°F) | 68 mm (2.7 inches) | 89% | moderate |
| March Weather | 9°C (48°F) | 97 mm (3.8 inches) | 86% | moderate |
| April Weather | 12°C (54°F) | 56 mm (2.2 inches) | 84% | high |
| May Weather | 16°C (61°F) | 118 mm (4.6 inches) | 82% | very high |
| June Weather | 21°C (69°F) | 88 mm (3.5 inches) | 82% | very high |
| July Weather | 23°C (73°F) | 79 mm (3.1 inches) | 79% | very high |
| August Weather | 22°C (72°F) | 89 mm (3.5 inches) | 72% | very high |
| September Weather | 18°C (65°F) | 75 mm (3.0 inches) | 78% | high |
| October Weather | 13°C (56°F) | 107 mm (4.2 inches) | 88% | moderate |
| November Weather | 8°C (46°F) | 104 mm (4.1 inches) | 91% | low |
| December Weather | 6°C (42°F) | 150 mm (5.9 inches) | 93% | low |