December in Toronto is the cloudiest month of the year. In December, the weather in Toronto is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Toronto has 16 cloudy, 7 rainy, 5 snowy, 2 sunny, and 1 partly cloudy day in December. The rains are usually moderate. December as well as March, April, October, and November is considered the most uncomfortable time to visit Toronto.