April in Princeton is the rainiest month of the year. In April, the weather in Princeton is typically cold. Average daily high temperature in April is about 4 degrees above zero. On average, Princeton has 22 rainy, 4 cloudy, 2 sunny, 1 snowy, and 1 partly cloudy day in April. The rains are usually moderate. April as well as March and May is considered the most uncomfortable time to visit Princeton.