December in Clovis is the coldest month of the year. In December, the weather in Clovis is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Clovis has 17 sunny, 12 partly cloudy, 1 rainy, and 1 cloudy day in December. The rains are usually light. December as well as January is considered the most uncomfortable time to visit Clovis.