Last updated: August 27, 2025
In December, the average temperature in Bielsa, Spain hovers around -1°C (31°F). Expect variability, with minimums plunging to -17°C (2°F) and maximums reaching up to 12°C (53°F). This month sees a precipitation amount of 152 mm (6.0 in), spread over 15 days, resulting in an average humidity of a rather high 88%. Prepare for a chilly, damp experience!
In December in Bielsa, the average temperature is -1°C (31°F). The maximum can reach 12°C (53°F), while the minimum can be as low as -17°C (2°F). Expect chilly weather with potential for significant cold, so be sure to pack warm layers for your trip.
In Bielsa in December, the precipitation amount is 152 mm (6.0 in) over the course of 15 days.
In Bielsa in December, humidity is 88%. With an average temperature of -1°C (31°F), this humidity feels like a biting cold that penetrates your clothing, making outdoor exploration challenging and the air clingy, adding an extra chill that can make you feel even colder than the temperature suggests.
In Bielsa 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 Bielsa, you can visit Hourly UV Index in Bielsa.
UV Risk Categories
Weather in Bielsa varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bielsa, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 94 mm (3.7 inches) | 87% | moderate |
| February Weather | 0°C (33°F) | 82 mm (3.2 inches) | 83% | moderate |
| March Weather | 1°C (35°F) | 119 mm (4.7 inches) | 80% | high |
| April Weather | 4°C (40°F) | 139 mm (5.5 inches) | 77% | very high |
| May Weather | 9°C (48°F) | 152 mm (6.0 inches) | 75% | very high |
| June Weather | 13°C (55°F) | 172 mm (6.8 inches) | 74% | extreme |
| July Weather | 15°C (60°F) | 119 mm (4.7 inches) | 72% | extreme |
| August Weather | 15°C (60°F) | 125 mm (4.9 inches) | 70% | very high |
| September Weather | 11°C (53°F) | 115 mm (4.5 inches) | 73% | very high |
| October Weather | 7°C (46°F) | 102 mm (4.0 inches) | 82% | high |
| November Weather | 1°C (35°F) | 110 mm (4.3 inches) | 87% | moderate |
| December Weather | -1°C (31°F) | 152 mm (6.0 inches) | 88% | low |