December in Härnösand is the windiest month of the year. In December, the weather in Härnösand is typically freezing. Average daily high temperature in December is about zero. On average, Härnösand has 8 snowy, 7 rainy, 7 cloudy, 5 sunny, and 4 partly cloudy days in December. The snowfalls are usually moderate. December as well as March, April, October, and November is considered the most uncomfortable time to visit Härnösand.