December in Overton is the rainiest and the cloudiest month of the year. In December, the weather in Overton is typically warm. Average daily high temperature in December is about 12 degrees above zero. On average, Overton has 9 sunny, 8 rainy, 8 partly cloudy, and 6 cloudy days in December. The rains are usually heavy. December as well as January is considered the most uncomfortable time to visit Overton.