January in Winnsboro is the coldest month of the year. In January, the weather in Winnsboro is typically warm. Average daily high temperature in January is about 11 degrees above zero. On average, Winnsboro has 11 sunny, 11 partly cloudy, 8 rainy, and 1 cloudy day in January. The rains are usually heavy. January as well as July, August, and December is considered the most uncomfortable time to visit Winnsboro.