January in Hazleton is the snowiest, the cloudiest, and the most freezing month of the year. In January, the weather in Hazleton is typically freezing. Average daily high temperature in January is about 1 degree below zero. On average, Hazleton has 16 cloudy, 7 snowy, 4 sunny, 3 partly cloudy, and 1 rainy day in January. The snowfalls are usually moderate.