April in Granby is the windiest month of the year. In April, the weather in Granby is typically cold. Average daily high temperature in April is about 5 degrees above zero. On average, Granby has 10 sunny, 8 snowy, 8 partly cloudy, and 4 cloudy days in April. The snowfalls are usually moderate. April as well as March, May, October, and November is considered the most uncomfortable time to visit Granby.