Last updated: August 27, 2025
In Sankt Stephan, Switzerland, the average temperature for December hovers around -6°C (22°F), with extremes ranging from a frigid -26°C (-15°F) to a relatively mild 7°C (44°F). During this month, expect about 248 mm (9.8 in) of precipitation spread over 18 days, contributing to an average humidity level of 91%. Prepare for a cold and damp experience!
In December in Sankt Stephan, the average temperature is -6°C (22°F). Maximums can reach 7°C (44°F), while minimums can drop as low as -26°C (-15°F). Travelers should be prepared for very cold conditions and dress in layers to stay warm.
In Sankt Stephan in December, the precipitation amount is 248 mm (9.8 in) over the course of 18 days.
In Sankt Stephan in December humidity is 91%. With an average temperature of -6°C (22°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and travel challenging as the air feels dense and heavy, potentially making it more difficult to breathe and leaving a frosty mist on your skin.
In Sankt Stephan 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 Sankt Stephan, you can visit Hourly UV Index in Sankt Stephan.
UV Risk Categories
Weather in Sankt Stephan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sankt Stephan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 174 mm (6.8 inches) | 91% | moderate |
| February Weather | -3°C (26°F) | 132 mm (5.2 inches) | 89% | moderate |
| March Weather | -1°C (31°F) | 161 mm (6.3 inches) | 87% | high |
| April Weather | 3°C (37°F) | 99 mm (3.9 inches) | 84% | very high |
| May Weather | 7°C (44°F) | 223 mm (8.8 inches) | 80% | very high |
| June Weather | 12°C (54°F) | 184 mm (7.2 inches) | 82% | extreme |
| July Weather | 13°C (56°F) | 224 mm (8.8 inches) | 82% | very high |
| August Weather | 13°C (55°F) | 196 mm (7.7 inches) | 77% | very high |
| September Weather | 9°C (49°F) | 131 mm (5.1 inches) | 81% | high |
| October Weather | 5°C (41°F) | 151 mm (5.9 inches) | 89% | high |
| November Weather | -1°C (31°F) | 107 mm (4.2 inches) | 89% | moderate |
| December Weather | -6°C (22°F) | 248 mm (9.8 inches) | 91% | low |