Last updated: August 27, 2025
In December, the average temperature in Olten, Switzerland hovers around 2°C (37°F), with minimums dipping to -5°C (24°F) and maximums peaking at 13°C (56°F). Expect 133 mm (5.2 in) of precipitation spread over 18 days, contributing to a notably high average humidity of 90%. Stay prepared for wet and chilly weather!
In December in Olten, the average temperature is 2°C (37°F), with maximums reaching 13°C (56°F) and minimums dropping as low as -5°C (24°F). It's advisable to dress in layers and prepare for chilly weather if you're planning to travel during this time.
In Olten in December, the precipitation amount is 133 mm (5.2 in) over a span of 18 days.
In Olten in December, humidity is 90%. With an average temperature of 2°C (37°F), this humidity feels like a damp chill that seeps into your bones, making even a short walk feel exhausting and uncomfortable for traveling.
In Olten 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 Olten, you can visit Hourly UV Index in Olten.
UV Risk Categories
Weather in Olten varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Olten, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 99 mm (3.9 inches) | 92% | low |
| February Weather | 3°C (38°F) | 85 mm (3.3 inches) | 89% | moderate |
| March Weather | 6°C (43°F) | 100 mm (4.0 inches) | 87% | moderate |
| April Weather | 10°C (50°F) | 73 mm (2.9 inches) | 84% | high |
| May Weather | 13°C (56°F) | 150 mm (5.9 inches) | 80% | very high |
| June Weather | 18°C (65°F) | 142 mm (5.6 inches) | 82% | very high |
| July Weather | 19°C (67°F) | 165 mm (6.5 inches) | 83% | very high |
| August Weather | 19°C (66°F) | 158 mm (6.2 inches) | 80% | very high |
| September Weather | 15°C (59°F) | 91 mm (3.6 inches) | 83% | high |
| October Weather | 10°C (51°F) | 109 mm (4.3 inches) | 90% | moderate |
| November Weather | 5°C (41°F) | 72 mm (2.8 inches) | 88% | low |
| December Weather | 2°C (37°F) | 133 mm (5.2 inches) | 90% | low |