December in Luton is the windiest month of the year. In December, the weather in Luton is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Luton has 15 rainy, 10 cloudy, 4 sunny, and 2 partly cloudy 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 Luton.