Last updated: August 27, 2025
In Trnovlje pri Celju, Slovenia, the average temperature in December hovers around 2°C (35°F). Be prepared for a range of temperatures, as it can dip to a chilling -15°C (5°F) or rise to a pleasant 15°C (60°F). Expect 86 mm (3.4 in) of precipitation spread over 9 days, alongside a high average humidity of 89%, creating a notably damp atmosphere.
In December in Trnovlje pri Celju, the average temperature is 2°C (35°F). The maximum can reach 15°C (60°F) and the minimum can be as low as -15°C (5°F). Be prepared for a wide range of temperatures if you plan to travel during this time.
In Trnovlje pri Celju in December, the precipitation amount is 86 mm (3.4 in), falling over the course of 9 days.
In Trnovlje pri Celju in December humidity is 89%. With an average temperature of 2°C (35°F), this humidity feels like a chilling dampness that clings to your skin, making outdoor exploration uncomfortable and requiring extra layers for warmth.
In Trnovlje pri Celju 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 Trnovlje pri Celju, you can visit Hourly UV Index in Trnovlje pri Celju.
UV Risk Categories
Weather in Trnovlje pri Celju varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Trnovlje pri Celju, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 37 mm (1.5 inches) | 90% | low |
| February Weather | 3°C (38°F) | 64 mm (2.5 inches) | 84% | moderate |
| March Weather | 6°C (43°F) | 57 mm (2.2 inches) | 78% | moderate |
| April Weather | 10°C (51°F) | 80 mm (3.2 inches) | 73% | high |
| May Weather | 15°C (58°F) | 142 mm (5.6 inches) | 71% | very high |
| June Weather | 20°C (68°F) | 82 mm (3.2 inches) | 73% | very high |
| July Weather | 21°C (70°F) | 121 mm (4.8 inches) | 70% | very high |
| August Weather | 21°C (70°F) | 104 mm (4.1 inches) | 60% | very high |
| September Weather | 16°C (61°F) | 127 mm (5.0 inches) | 65% | high |
| October Weather | 11°C (52°F) | 71 mm (2.8 inches) | 84% | moderate |
| November Weather | 6°C (43°F) | 98 mm (3.9 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 86 mm (3.4 inches) | 89% | low |