Last updated: August 22, 2025
In December, the average temperature in Tsar Kaloyan, Bulgaria hovers at a brisk 3°C (38°F). While the mercury can dip to a frigid -10°C (14°F), it may also rise to a pleasant 17°C (63°F). Expect 66 mm (2.6 in) of precipitation over approximately 13 days, accompanied by a high average humidity of 87%.
In December in Tsar Kaloyan, the average temperature is 3°C (38°F). Maximum temperatures can reach 17°C (63°F), while the minimum can drop as low as -10°C (14°F). Be sure to pack accordingly if you're traveling during this time!
In Tsar Kaloyan in December, the total precipitation amount is 66 mm (2.6 in) spread over the course of 13 days.
In Tsar Kaloyan in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Tsar Kaloyan 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 Tsar Kaloyan, you can visit Hourly UV Index in Tsar Kaloyan.
UV Risk Categories
Weather in Tsar Kaloyan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Tsar Kaloyan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 44 mm (1.7 inches) | 88% | low |
| February Weather | 4°C (39°F) | 48 mm (1.9 inches) | 84% | moderate |
| March Weather | 6°C (43°F) | 70 mm (2.7 inches) | 81% | high |
| April Weather | 11°C (53°F) | 40 mm (1.6 inches) | 70% | high |
| May Weather | 17°C (62°F) | 71 mm (2.8 inches) | 72% | very high |
| June Weather | 21°C (69°F) | 135 mm (5.3 inches) | 66% | very high |
| July Weather | 23°C (73°F) | 82 mm (3.2 inches) | 62% | very high |
| August Weather | 24°C (75°F) | 31 mm (1.2 inches) | 48% | very high |
| September Weather | 19°C (67°F) | 23 mm (0.9 inches) | 58% | high |
| October Weather | 13°C (56°F) | 60 mm (2.3 inches) | 78% | moderate |
| November Weather | 8°C (47°F) | 51 mm (2.0 inches) | 85% | moderate |
| December Weather | 3°C (38°F) | 66 mm (2.6 inches) | 87% | low |