National Weather Service United States Department of Commerce

weather fatalities chart, details in text
Also available is the
79-Year List of Severe Weather Fatalities

Preliminary Hazardous Weather Statistics for 2018 Now Online

The U.S. Natural Hazard Statistics provide statistical information on fatalities, injuries and damages caused by weather related hazards. These statistics are compiled by the Office of Services and the National Climatic Data Center from information contained in Storm Data, a report comprising data from NWS forecast offices in the 50 states, Puerto Rico, Guam and the Virgin Islands.

The  Centers for Disease Control and Prevention is the official government source of cause of death in the United States, including weather-related fatalities.