January in Bethlehem is the snowiest and the coldest month of the year. In January, the weather in Bethlehem is typically freezing. Average daily high temperature in January is about zero. On average, Bethlehem has 10 partly cloudy, 7 sunny, 6 cloudy, 4 rainy, and 4 snowy days in January. The rains are usually heavy. January as well as February, March, April, and October is considered the most uncomfortable time to visit Bethlehem.