October 3
- 1903 – An F4 tornado devastated St. Charles, Minnesota, killing 7 people and injuring 30. The same tornado or a member of the same tornado family killed two people in and near Independence, Wisconsin. Another F4 tornado killed at least 4 people as it destroyed farms between Bancroft and Sheridan, Wisconsin. An F3 tornado killed 3 people near Hollowayville, Illinois.
- 1964 – The first day of a two day tornado outbreak from Hurricane Hilda spawned six tornadoes in Louisiana and Mississippi. A short-lived but devastating F4 tornado hit the northern part of Larose, Louisiana, killing 22 people. This was the deadliest hurricane-spawned tornado on record and one of only two to be rated F4.
- 1979 – An F4 tornado struck parts of Windsor Locks and Suffield, Connecticut, and Feeding Hills, Massachusetts, killing three people, injuring 500, and causing $400 million in damage, equivalent to $1.679 billion in 2023, marking it as the ninth costliest tornado in U.S. history.