March in New Haven is the windiest month of the year. In March, the weather in New Haven is typically cold. Average daily high temperature in March is about 8 degrees above zero. On average, New Haven has 11 sunny, 8 rainy, 8 partly cloudy, 3 cloudy, and 1 snowy day in March. The rains are usually heavy. March as well as January, February, April, and November is considered the most uncomfortable time to visit New Haven.