In March, the weather in Rosemont is typically cold. Average daily high temperature in March is about 8 degrees above zero. On average, Rosemont has 10 sunny, 8 partly cloudy, 6 rainy, 6 cloudy, and 1 snowy day in March. The rains are usually heavy. March as well as January, February, April, and May is considered the most uncomfortable time to visit Rosemont.