Southeastern Bergen County lies at the edge of the humid subtropical climate zone according to the Köppen climate classification because its coldest month (January) averages above 26.6 °F / -3 °C [REF].
In recent years, average temperatures in the county seat of Hackensack have ranged from a low of in January to a high of in July, although a record low of was recorded in February 1934 and a record high of was recorded in July 1936.