the United States Department of Agriculture (USDA ... Cumberland County remains in the 7a zone, indicating average annual minimum winter temperatures from 0 to 5 degrees Fahrenheit, the new map ...

and a sliver of Somerset County) to a high of Zone 8a (the warmest parts of Philadelphia). The range went from Zone 5a to Zone 7b in the last map. The new map was developed jointly by USDA’s ...