December in Egilsstaðir is the windiest and the most freezing month of the year. In December, the weather in Egilsstaðir is typically freezing. Average daily high temperature in December is about 2 degrees below zero. On average, Egilsstaðir has 27 snowy, 2 sunny, 1 rainy, and 1 cloudy day in December. The snowfalls are usually heavy.