December in Yreka is the rainiest and the coldest month of the year. In December, the weather in Yreka is typically cold. Average daily high temperature in December is about 4 degrees above zero. On average, Yreka has 12 rainy, 9 partly cloudy, 8 sunny, and 2 cloudy days in December. The rains are usually heavy. December as well as January, February, and March is considered the most uncomfortable time to visit Yreka.