In December, the weather in Newcastle upon Tyne is typically cold. Average daily high temperature in December is about 6 degrees above zero. On average, Newcastle upon Tyne has 11 rainy, 9 cloudy, 6 partly cloudy, and 5 sunny days in December. The rains are usually light. December as well as January, February, March, and June is considered the most uncomfortable time to visit Newcastle upon Tyne.