In December, the weather in Ruda Slaska is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Ruda Slaska has 12 cloudy, 8 partly cloudy, 7 rainy, 2 snowy, and 2 sunny 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 Ruda Slaska.