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 13 rainy, 7 cloudy, 7 partly cloudy, and 4 sunny days in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Newcastle upon Tyne.