In December, the weather in Parry Sound is typically freezing. Average daily high temperature in December is about zero. On average, Parry Sound has 11 cloudy, 8 snowy, 7 partly cloudy, 3 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 Parry Sound.