January in Greenville is the snowiest, the windiest, and the coldest month of the year. In January, the weather in Greenville is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Greenville has 10 cloudy, 9 partly cloudy, 7 sunny, 4 snowy, and 1 rainy day in January. The snowfalls are usually light. January as well as February, March, and December is considered the most uncomfortable time to visit Greenville.