December in Osnabruck is the rainiest and the windiest month of the year. In December, the weather in Osnabruck is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Osnabruck has 22 rainy, 7 cloudy, and 2 sunny days in December. The rains are usually moderate. December as well as January, February, March, and November is considered the most uncomfortable time to visit Osnabruck.