April in Addison is the rainiest and the windiest month of the year. In April, the weather in Addison is typically warm. Average daily high temperature in April is about 13 degrees above zero. On average, Addison has 13 rainy, 6 sunny, 6 partly cloudy, and 5 cloudy days in April. The rains are usually heavy. April as well as February, March, November, and December is considered the most uncomfortable time to visit Addison.