In December, the weather in Danville is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Danville has 9 cloudy, 8 rainy, 7 partly cloudy, 6 sunny, and 1 snowy day in December. The rains are usually heavy. December as well as January, February, March, and November is considered the most uncomfortable time to visit Danville.