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Hillsdale is a borough in Bergen County, New Jersey, United States. As of the 2010 census, the borough population was 10,219.
Hillsdale County Weather. The average temperature of Hillsdale County is 48.06Â°F, which is higher than the Michigan average temperature of 46.64Â°F and is much lower than the national average temperature of 54.45Â°F. Historical Weather.