March in Florissant is the rainiest month of the year. In March, the weather in Florissant is typically warm. Average daily high temperature in March is about 12 degrees above zero. On average, Florissant has 13 rainy, 8 sunny, 6 partly cloudy, and 4 cloudy days in March. The rains are usually heavy. March as well as January, February, and December is considered the most uncomfortable time to visit Florissant.