In December, the weather in New Carrollton is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, New Carrollton has 10 sunny, 10 partly cloudy, 7 rainy, and 4 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and July is considered the most uncomfortable time to visit New Carrollton.