Last updated: August 23, 2025
In Sainte-Helene-sur-Isere, France, the average temperature in December hovers around -1°C (30°F). Expect chilly conditions, with minimums dipping as low as -15°C (6°F) and maximums reaching just 9°C (49°F). During this time, precipitation accumulates to about 252 mm (9.9 in) over approximately 17 days, adding to the overall dampness, with average humidity levels at a brisk 90%.
In December in Sainte-Helene-sur-Isere, the average temperature is -1°C (30°F), with maximums reaching 9°C (49°F) and minimums dropping as low as -15°C (6°F). Be sure to pack warm clothing if you're planning to visit during this chilly period.
In Sainte-Helene-sur-Isere in December, the precipitation amount is 252 mm (9.9 in) over the course of 17 days.
In Sainte-Helene-sur-Isere in December, humidity is 90%. With an average temperature of -1°C (30°F), this humidity feels like a bone-chilling dampness that seeps into your clothes, making outdoor activities uncomfortable and travel quite challenging.
In Sainte-Helene-sur-Isere 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 Sainte-Helene-sur-Isere, you can visit Hourly UV Index in Sainte-Helene-sur-Isere.
UV Risk Categories
Weather in Sainte-Helene-sur-Isere varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sainte-Helene-sur-Isere, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 140 mm (5.5 inches) | 91% | moderate |
| February Weather | 1°C (33°F) | 116 mm (4.6 inches) | 87% | moderate |
| March Weather | 3°C (38°F) | 154 mm (6.1 inches) | 84% | high |
| April Weather | 6°C (44°F) | 84 mm (3.3 inches) | 83% | very high |
| May Weather | 10°C (50°F) | 196 mm (7.7 inches) | 78% | very high |
| June Weather | 15°C (59°F) | 165 mm (6.5 inches) | 75% | very high |
| July Weather | 17°C (62°F) | 129 mm (5.1 inches) | 72% | very high |
| August Weather | 16°C (62°F) | 125 mm (4.9 inches) | 63% | very high |
| September Weather | 12°C (55°F) | 92 mm (3.6 inches) | 73% | high |
| October Weather | 8°C (47°F) | 118 mm (4.6 inches) | 89% | moderate |
| November Weather | 2°C (37°F) | 115 mm (4.5 inches) | 90% | moderate |
| December Weather | -1°C (30°F) | 252 mm (9.9 inches) | 90% | low |