December in The Woodlands is the cloudiest month of the year. In December, the weather in The Woodlands is typically warm. Average daily high temperature in December is about 15 degrees above zero. On average, The Woodlands has 14 rainy, 7 sunny, 5 cloudy, and 5 partly cloudy days in December. The rains are usually heavy. December as well as September is considered the most uncomfortable time to visit The Woodlands.