January in Greensboro is the coldest month of the year. In January, the weather in Greensboro is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Greensboro has 13 sunny, 12 partly cloudy, and 6 rainy days in January. The rains are usually moderate. January as well as February and December is considered the most uncomfortable time to visit Greensboro.