January in Northampton is the snowiest and the coldest month of the year. In January, the weather in Northampton is typically freezing. Average daily high temperature in January is about zero. On average, Northampton has 11 partly cloudy, 9 sunny, 5 snowy, 4 cloudy, and 2 rainy days in January. The snowfalls are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Northampton.