January in Monroeville is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Monroeville is typically freezing. Average daily high temperature in January is about zero. On average, Monroeville has 13 cloudy, 9 snowy, 6 rainy, and 3 sunny days in January. The snowfalls are usually moderate. January as well as February, March, and December is considered the most uncomfortable time to visit Monroeville.