December in Primorsko is the windiest month of the year. In December, the weather in Primorsko is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Primorsko has 11 rainy, 10 partly cloudy, 9 sunny, and 1 cloudy day in December. The rains are usually heavy. December as well as January, February, and March is considered the most uncomfortable time to visit Primorsko.