In December, the weather in Borovets is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Borovets has 9 sunny, 9 partly cloudy, 6 cloudy, 4 rainy, and 3 snowy days in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Borovets.