December in Redding is the rainiest and the coldest month of the year. In December, the weather in Redding is typically warm. Average daily high temperature in December is about 11 degrees above zero. On average, Redding has 14 sunny, 10 partly cloudy, and 7 rainy days in December. The rains are usually light. December as well as February is considered the most uncomfortable time to visit Redding.