December weather forecast in Nantucket

December in Nantucket is the rainiest and the cloudiest month of the year. In December, the weather in Nantucket is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Nantucket has 14 rainy, 7 sunny, 5 cloudy, and 5 partly cloudy days in December. The rains are usually heavy. December as well as January, February, and March is considered the most uncomfortable time to visit Nantucket.