January in Mamaroneck is the snowiest and the coldest month of the year. In January, the weather in Mamaroneck is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Mamaroneck has 12 sunny, 8 partly cloudy, 5 rainy, 4 cloudy, and 2 snowy days in January. The rains are usually heavy. January as well as February, March, April, and November is considered the most uncomfortable time to visit Mamaroneck.