December weather forecast
Sveti Vlas, Bulgaria

Finally, December escorts Sveti Vlas into the embrace of winter, with temperature maxima dipping to 7°C (44.6°F) and the night chill settling at around 1°C (33.8°F). The rainfall relaxes slightly from November's high but is still considerable, setting a wet winter scene. The sea feels the chill, reducing opportunities for water-related activities. The daylight period reaches its annual low, making the days noticeably shorter. December in Sveti Vlas thus serves as a launching pad into the Bulgarian winter atmosphere.

Temperature

Onset of December witnesses a reduction in the average high-temperature, falling from a moderate 13°C (55.4°F) in November to a chilly 7°C (44.6°F). An average low-temperature of 1°C (33.8°F) marks the month of December.

Rainfall

In Sveti Vlas, Bulgaria, during December, the rain falls for 8 days and regularly aggregates up to 60mm (2.36") of precipitation. In Sveti Vlas, Bulgaria, during the entire year, the rain falls for 76 days and collects up to 566mm (22.28") of precipitation.

Sea temperature

In Sveti Vlas, in December, the average water temperature is 10°C (50°F).
Note: Swimming in 10°C (50°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 07:19 and sunset at 16:36. On the last day of December, sunrise is at 07:39 and sunset at 16:45 EET.

Sunshine

With an average of 2h of sunshine, December has the least sunshine of the year in Sveti Vlas.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum high daily UV index of 1 during December translates into the following directions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.