In December, the weather in Frederikshavn is typically cold. Average daily high temperature in December is about 4 degrees above zero. On average, Frederikshavn has 14 rainy, 9 cloudy, 5 partly cloudy, and 3 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 Frederikshavn.