Last updated: August 27, 2025
In December, the average temperature in Castel San Pietro, Switzerland hovers around 5°C (41°F). Expect a chilly minimum of -3°C (28°F) and a milder maximum reaching 14°C (58°F). Throughout the month, you can anticipate 94 mm (3.7 in) of precipitation spread across 8 days, with an average humidity of 85% - perfect for cozy indoor activities!
In December in Castel San Pietro, the average temperature is 5°C (41°F). Maximum temperatures can reach 14°C (58°F), while the minimum can dip as low as -3°C (28°F). Be prepared for a mix of chilly days and mild spells, making it essential to pack layers for your travels.
In Castel San Pietro in December, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.
In Castel San Pietro in December, humidity is 85%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration a challenge as the cold air clings to your skin.
In Castel San Pietro 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 Castel San Pietro, you can visit Hourly UV Index in Castel San Pietro.
UV Risk Categories
Weather in Castel San Pietro varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Castel San Pietro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 42 mm (1.7 inches) | 88% | low |
| February Weather | 6°C (43°F) | 46 mm (1.8 inches) | 81% | moderate |
| March Weather | 9°C (48°F) | 88 mm (3.5 inches) | 76% | moderate |
| April Weather | 13°C (56°F) | 124 mm (4.9 inches) | 77% | high |
| May Weather | 17°C (63°F) | 143 mm (5.6 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 161 mm (6.4 inches) | 71% | very high |
| July Weather | 24°C (75°F) | 164 mm (6.5 inches) | 67% | very high |
| August Weather | 24°C (75°F) | 136 mm (5.3 inches) | 64% | very high |
| September Weather | 19°C (66°F) | 146 mm (5.8 inches) | 74% | high |
| October Weather | 14°C (58°F) | 152 mm (6.0 inches) | 87% | moderate |
| November Weather | 9°C (49°F) | 169 mm (6.7 inches) | 88% | moderate |
| December Weather | 5°C (41°F) | 94 mm (3.7 inches) | 85% | low |