December in Yuba City is the coldest month of the year. In December, the weather in Yuba City is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, Yuba City has 12 sunny, 11 partly cloudy, 7 rainy, and 1 cloudy day in December. The rains are usually moderate. December as well as January, February, and March is considered the most uncomfortable time to visit Yuba City.