In March, the weather in Truro is typically cold. Average daily high temperature in March is about 2 degrees above zero. On average, Truro has 8 cloudy, 8 partly cloudy, 7 sunny, 4 rainy, and 4 snowy days in March. The rains are usually heavy. March as well as April, May, October, and November is considered the most uncomfortable time to visit Truro.