December in Rottenburg am Neckar is the cloudiest month of the year. In December, the weather in Rottenburg am Neckar is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Rottenburg am Neckar has 9 rainy, 9 partly cloudy, 8 cloudy, 3 sunny, and 2 snowy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Rottenburg am Neckar.