In 2010, near Vivian, South Dakota was where the largest hail fell. It measured 8 inches in diameter. it was 18.5 in circumference. It weighed 1.9375.
The person that found the hail said that it was about the size of a volleyball. He put it in his freeze. The next day the inspected the hail. It was the largest hail reported weighing almost 2 pounds. The circumference was 18.62.