December in Lewiston is the snowiest and the coldest month of the year. In December, the weather in Lewiston is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Lewiston has 12 rainy, 9 snowy, 6 cloudy, 3 sunny, and 1 partly cloudy day in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Lewiston.