In December, the weather in Tournon-sur-Rhone is typically cold. Average daily high temperature in December is about 6 degrees above zero. On average, Tournon-sur-Rhone has 12 rainy, 9 cloudy, 7 sunny, and 3 partly cloudy days in December. The rains are usually light. December as well as January, February, and November is considered the most uncomfortable time to visit Tournon-sur-Rhone.