Last updated: March 2, 2024
The weather in Willisau, Switzerland, during December is characterized by an average temperature of 1°C (35°F). Highs can soar to 11°C (52°F), while lows may dip to -6°C (21°F). Typically, the humidity level in Willisau throughout December hovers around 90%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In December, Willisau averages 152 mm (6.0 inches) of rainfall, typically over the course of 19 rainy days. The month enjoys an average of 8 hours 33 minutes of daylight, with the sun shining for approximately 6 hours 0 minutes each day. Additionally, there is a 29% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In December, the UV Index in Willisau reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 45 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 0 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||