January in Hazlet is the coldest month of the year. In January, the weather in Hazlet is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Hazlet has 14 partly cloudy, 9 sunny, 7 rainy, and 1 cloudy day in January. The rains are usually moderate. January as well as February, March, and December is considered the most uncomfortable time to visit Hazlet.