July 's average U.S. temperature topped 20th-century average by more than 3 degrees . they ca n't feed and spurred the U.S. Department of Agriculture to designate more than half of all U.S. counties as disaster zones . Comment: The high temperatures have contributed to a drought that has battered farmers .
July 's average U.S. temperature topped 20th-century average by more than 3 degrees . Comment: The high temperatures have contributed to a drought that has battered farmers .