May had the highest average deaths from tornadoes in the specified period due to the spring season's conditions.
The month with the highest average number of deaths caused by tornadoes in the United States between 1950 and 1999 was May. Tornadoes are more common in the spring season due to the contrast between cold and warm air masses. An example of a devastating tornado event is the EF5 tornado that struck Joplin, Missouri on May 22, 2011, resulting in significant destruction and casualties.
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