The following is sourced from NOAA at: https://www.ncei.noaa.gov/access/billions/

The U.S. has sustained 400 weather and climate disasters since 1980 in which overall damages/costs reached or exceeded $1 billion. Values in parentheses represent the 2024 Consumer Price Index cost adjusted value (if different than original value). The total cost of these 400 events exceeds $2.785 trillion.

Select the NCEI link (above) for a listing of the billion dollar events during the past 45 years.