December in Sitka is the snowiest and the coldest month of the year. In December, the weather in Sitka is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Sitka has 17 rainy, 10 snowy, 3 sunny, and 1 cloudy day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Sitka.