Last updated: August 27, 2025
In December, the average temperature in Osso de Sio, Spain hovers around 6°C (44°F). Expect chilly nights with minimums dropping to -4°C (25°F), while daytime highs can reach a pleasant 17°C (62°F). This month, anticipate about 24 mm (0.9 in) of precipitation over 4 days, contributing to an average humidity of 79%. Be prepared for a mix of cool and rainy days!
In December, in Osso de Sio, the average temperature is 6°C (44°F). The maximum can reach 17°C (62°F), and the minimum can be as low as -4°C (25°F). Overall, be prepared for a cool climate and pack layers to stay comfortable while exploring.
In Osso de Sio in December, the precipitation amount is 24 mm (0.9 in) over a period of 4 days.
In Osso de Sio in December, humidity is 79%. With an average temperature of 6°C (44°F), this humidity feels like a cold, damp chill that seeps into your bones, making travel feel less comfortable and more challenging as the wet air clings to your clothes and skin.
In Osso de Sio 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 Osso de Sio, you can visit Hourly UV Index in Osso de Sio.
UV Risk Categories
Weather in Osso de Sio varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Osso de Sio, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 37 mm (1.5 inches) | 79% | moderate |
| February Weather | 8°C (47°F) | 29 mm (1.1 inches) | 74% | moderate |
| March Weather | 10°C (50°F) | 52 mm (2.0 inches) | 71% | moderate |
| April Weather | 13°C (55°F) | 75 mm (3.0 inches) | 69% | very high |
| May Weather | 17°C (63°F) | 65 mm (2.6 inches) | 66% | very high |
| June Weather | 21°C (71°F) | 58 mm (2.3 inches) | 65% | extreme |
| July Weather | 25°C (77°F) | 30 mm (1.2 inches) | 64% | very high |
| August Weather | 25°C (76°F) | 68 mm (2.7 inches) | 64% | very high |
| September Weather | 20°C (68°F) | 56 mm (2.2 inches) | 68% | very high |
| October Weather | 15°C (60°F) | 83 mm (3.3 inches) | 77% | high |
| November Weather | 9°C (49°F) | 53 mm (2.1 inches) | 79% | moderate |
| December Weather | 6°C (44°F) | 24 mm (0.9 inches) | 79% | low |