January in Roswell is the windiest and the coldest month of the year. In January, the weather in Roswell is typically cold. Average daily high temperature in January is about 9 degrees above zero. On average, Roswell has 14 sunny, 8 rainy, 8 partly cloudy, and 1 cloudy day in January. The rains are usually moderate. January as well as February, August, and December is considered the most uncomfortable time to visit Roswell.