December in Mafra is the windiest and the cloudiest month of the year. In December, the weather in Mafra is typically warm. Average daily high temperature in December is about 14 degrees above zero. On average, Mafra has 13 rainy, 8 sunny, 7 partly cloudy, and 3 cloudy 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 Mafra.