December in Clovis is the coldest month of the year. In December, the weather in Clovis is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, Clovis has 16 sunny, 12 partly cloudy, and 3 rainy days in December. The rains are usually moderate. December as well as January, July, and August is considered the most uncomfortable time to visit Clovis.