December in Bonnyville is the most freezing month of the year. In December, the weather in Bonnyville is typically freezing. Average daily high temperature in December is about 10 degrees below zero. On average, Bonnyville has 25 cloudy, 3 sunny, 2 partly cloudy, and 1 snowy day in December. The snowfalls are usually light. December as well as January and April is considered the most uncomfortable time to visit Bonnyville.