Last updated: August 23, 2025
In December, the average temperature in Jassans-Riottier, France hovers around 5°C (41°F). Expect chilly nights with a minimum dropping to -4°C (24°F), while daytime highs can reach up to 16°C (62°F). Be prepared for a splash of rain, with 134 mm (5.3 in) of precipitation spread over 17 days, contributing to an average humidity of 92%.
In December in Jassans-Riottier, the average temperature is 5°C (41°F). Maximums can reach 16°C (62°F) and minimums can be as low as -4°C (24°F). Be prepared for a range of temperatures if you're planning to travel during this time!
In Jassans-Riottier in December, the total precipitation amount is 134 mm (5.3 in) over 17 days.
In Jassans-Riottier in December humidity is 92%. With an average temperature of 5°C (41°F), this humidity feels like a cold, damp blanket enveloping you, making travel uncomfortable and dampening the spirits of those unprepared for the chill.
In Jassans-Riottier 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 Jassans-Riottier, you can visit Hourly UV Index in Jassans-Riottier.
UV Risk Categories
Weather in Jassans-Riottier varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Jassans-Riottier, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (38°F) | 75 mm (2.9 inches) | 91% | low |
| February Weather | 6°C (43°F) | 59 mm (2.3 inches) | 88% | moderate |
| March Weather | 8°C (47°F) | 82 mm (3.2 inches) | 84% | moderate |
| April Weather | 12°C (54°F) | 54 mm (2.1 inches) | 81% | high |
| May Weather | 15°C (60°F) | 118 mm (4.6 inches) | 77% | very high |
| June Weather | 20°C (69°F) | 86 mm (3.4 inches) | 76% | very high |
| July Weather | 22°C (72°F) | 79 mm (3.1 inches) | 68% | very high |
| August Weather | 22°C (71°F) | 81 mm (3.2 inches) | 61% | very high |
| September Weather | 18°C (64°F) | 75 mm (2.9 inches) | 72% | high |
| October Weather | 13°C (55°F) | 101 mm (4.0 inches) | 88% | moderate |
| November Weather | 7°C (45°F) | 97 mm (3.8 inches) | 91% | moderate |
| December Weather | 5°C (41°F) | 134 mm (5.3 inches) | 92% | low |