December in Barrie is the cloudiest month of the year. In December, the weather in Barrie is typically freezing. Average daily high temperature in December is about zero. On average, Barrie has 12 cloudy, 7 snowy, 6 partly cloudy, 4 rainy, and 2 sunny days in December. The snowfalls are usually moderate. December as well as March, April, October, and November is considered the most uncomfortable time to visit Barrie.