June 12
- 1899 – An F5 tornado, one of the deadliest in U.S. history, devastated much of New Richmond, Wisconsin, leveling numerous buildings and killing 117 people. The high death toll was in part due to about 1,000 people visiting from out of town to attend a circus, which ended about an hour before the tornado formed.
- 1942 – An F4 tornado moved erratically through the southwest side of Oklahoma City, destroying more than 70 homes and killing 35 people.