December weather forecast in Saint John

December in Saint John is the windiest month of the year. In December, the weather in Saint John is typically freezing. Average daily high temperature in December is about 1 degree above zero. On average, Saint John has 12 rainy, 6 snowy, 5 sunny, 5 partly cloudy, and 3 cloudy days in December. The rains are usually heavy. December as well as March, April, May, and October is considered the most uncomfortable time to visit Saint John.