Last updated: August 27, 2025
In Kostel, Slovenia, the average temperature in December hovers around 2°C (36°F). You may experience a chill, with minimum temperatures dropping to a brisk -16°C (3°F), while the mercury can rise as high as 15°C (59°F). Expect 139 mm (5.5 in) of precipitation over 13 days, contributing to an average humidity of 88%—perfect for cozy indoor activities!
In December in Kostel, the average temperature is 2°C (36°F). The maximum can reach 15°C (59°F), while the minimum can be as low as -16°C (3°F). Travelers should be prepared for a wide range of temperatures, from chilly days to the potential for frost, so layering is essential.
In Kostel in December, the precipitation amount is 139 mm (5.5 in) over the course of 13 days.
In Kostel in December, humidity is 88%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket wrapping around you, making traveling uncomfortable and energy-draining as every step through the chill seems heavier in the thick air.
In Kostel 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 Kostel, you can visit Hourly UV Index in Kostel.
UV Risk Categories
Weather in Kostel varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Kostel, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 71 mm (2.8 inches) | 88% | low |
| February Weather | 3°C (37°F) | 109 mm (4.3 inches) | 82% | moderate |
| March Weather | 5°C (41°F) | 81 mm (3.2 inches) | 73% | moderate |
| April Weather | 9°C (49°F) | 110 mm (4.3 inches) | 73% | high |
| May Weather | 13°C (56°F) | 183 mm (7.2 inches) | 70% | very high |
| June Weather | 19°C (66°F) | 108 mm (4.3 inches) | 69% | very high |
| July Weather | 20°C (68°F) | 142 mm (5.6 inches) | 63% | very high |
| August Weather | 20°C (68°F) | 109 mm (4.3 inches) | 51% | very high |
| September Weather | 15°C (59°F) | 159 mm (6.3 inches) | 64% | high |
| October Weather | 10°C (51°F) | 119 mm (4.7 inches) | 83% | moderate |
| November Weather | 6°C (43°F) | 127 mm (5.0 inches) | 89% | moderate |
| December Weather | 2°C (36°F) | 139 mm (5.5 inches) | 88% | low |