December in Bansko is the windiest month of the year. In December, the weather in Bansko is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Bansko has 10 rainy, 9 sunny, 8 partly cloudy, 3 cloudy, and 1 snowy day in December. The rains are usually heavy. December as well as February, March, April, and May is considered the most uncomfortable time to visit Bansko.