December in Chatham-Kent is the windiest month of the year. In December, the weather in Chatham-Kent is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Chatham-Kent has 17 cloudy, 10 rainy, 3 sunny, and 1 snowy day in December. The rains are usually moderate. December as well as March and April is considered the most uncomfortable time to visit Chatham-Kent.