In December, the weather in Roanoke is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Roanoke has 8 sunny, 8 cloudy, 8 partly cloudy, 6 rainy, and 1 snowy day in December. The rains are usually heavy. December as well as January, February, and March is considered the most uncomfortable time to visit Roanoke.