April in Vernon is the windiest month of the year. In April, the weather in Vernon is typically cold. Average daily high temperature in April is about 10 degrees above zero. On average, Vernon has 11 rainy, 8 partly cloudy, 6 cloudy, and 5 sunny days in April. The rains are usually moderate. April as well as February, March, May, and June is considered the most uncomfortable time to visit Vernon.