Montclair is in the temperate zone.
New Jersey’s geographic position in the mid-latitudes often places it near the jet stream, particularly in the late fall, winter, and spring, giving the state its characteristic varied weather. Precipitation is frequent because low-pressure storms associated with the jet stream commonly affect the state. In addition, New Jersey’s location on the eastern coast of North America exposes it to the cold winter and warm summer air masses of the continental interior and the moderate and moist air masses of the western Atlantic Ocean. In winter, the contrast between the frigid air masses of the continental interior and the relatively warm Atlantic provides the energy for occasional intense storms known as nor’easters. As a result of these influences, New Jersey’s climate is characterized by moderately cold and occasionally snowy winters and warm, humid summers.
In Montclair, the summers are warm, humid, and wet; the winters are very cold and snowy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 23°F to 85°F and is rarely below 10°F or above 92°F.
The National Oceanic and Atmospheric Administration provides detailed state climate summaries including key messages, temperature, precipitation, and extreme climate events.