January in Peterborough is the coldest month of the year. In January, the weather in Peterborough is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Peterborough has 11 rainy, 9 partly cloudy, 7 cloudy, and 4 sunny days in January. The rains are usually light. January as well as February, March, April, and October is considered the most uncomfortable time to visit Peterborough.