December in Langley is the windiest and the coldest month of the year. In December, the weather in Langley is typically cold. Average daily high temperature in December is about 4 degrees above zero. On average, Langley has 16 rainy, 7 cloudy, 5 sunny, 2 partly cloudy, and 1 snowy day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Langley.