In March, the weather in Napanee is typically cold. Average daily high temperature in March is about 2 degrees above zero. On average, Napanee has 15 cloudy, 8 rainy, 4 sunny, 3 partly cloudy, and 1 snowy day in March. The rains are usually heavy. March as well as April, October, November, and December is considered the most uncomfortable time to visit Napanee.