Last updated: August 27, 2025
In Castiello de Jaca, Spain, the average temperature in December hovers around 1°C (35°F). Prepare for chilly days, with minimums plummeting to -12°C (10°F) and highs reaching only 11°C (52°F). Expect 208 mm (8.2 in) of precipitation spread over 16 days, and don’t forget your rain gear, as the average humidity sits at a brisk 87%.
In December in Castiello de Jaca, the average temperature is 1°C (35°F). The maximum can reach 11°C (52°F), while the minimum can drop as low as -12°C (10°F). Travelers should prepare for chilly conditions and dress in layers to stay warm during their visit.
In Castiello de Jaca in December, the precipitation amount is 208 mm (8.2 in) over the course of 16 days.
In Castiello de Jaca in December humidity is 87%. With an average temperature of 1°C (35°F), this humidity feels like a chilling dampness that seeps into your bones, making travel feel particularly uncomfortable as the cold air clings to your skin and makes each step feel heavier.
In Castiello de Jaca 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 Castiello de Jaca, you can visit Hourly UV Index in Castiello de Jaca.
UV Risk Categories
Weather in Castiello de Jaca varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Castiello de Jaca, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 129 mm (5.1 inches) | 86% | moderate |
| February Weather | 2°C (36°F) | 113 mm (4.4 inches) | 85% | moderate |
| March Weather | 3°C (38°F) | 144 mm (5.7 inches) | 82% | high |
| April Weather | 6°C (42°F) | 139 mm (5.5 inches) | 81% | very high |
| May Weather | 10°C (50°F) | 148 mm (5.8 inches) | 80% | very high |
| June Weather | 14°C (58°F) | 171 mm (6.7 inches) | 81% | extreme |
| July Weather | 17°C (63°F) | 110 mm (4.3 inches) | 80% | extreme |
| August Weather | 17°C (63°F) | 109 mm (4.3 inches) | 76% | very high |
| September Weather | 13°C (56°F) | 114 mm (4.5 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 120 mm (4.7 inches) | 81% | high |
| November Weather | 3°C (38°F) | 140 mm (5.5 inches) | 85% | moderate |
| December Weather | 1°C (35°F) | 208 mm (8.2 inches) | 87% | low |