January in Clarksville is the coldest month of the year. In January, the weather in Clarksville is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Clarksville has 8 rainy, 8 cloudy, 8 partly cloudy, and 7 sunny days in January. The rains are usually moderate. January as well as February, March, May, and December is considered the most uncomfortable time to visit Clarksville.