USDA Hail and Corn Kernel Sizes
In 1967, the US Department of Agriculture and the National Weather Service agreed to adopt equivalent sizes for hailstones and for corn, peas, and other kernel-based vegetables. The move was part of a larger Bureau of Standards push to standardize all government measurements under President Lyndon Johnson’s “Great Society” program. The new sizes for all were:
These standardized measurements were abandoned when the National Weather Service switched to the metric system in 1998.