Most of the cost from weather events isn’t born by the federal government. Looking just at extreme 1+ billion dollar weather events over the last 20 years averages close to 100 billion per year in the US. “The total cost of these 298 events exceeds $1.975 trillion.”
However, things are getting worse. “The 1980–2020 annual average is 7.1 events (CPI-adjusted); the annual average for the most recent 5 years (2016–2020) is 16.2 events (CPI-adjusted).“ https://www.ncdc.noaa.gov/billions/
Of course not all of that is based on climate change, but smaller storms also cost money for everything from snow removal to lost crops, and preparation for storms costs even more.
The US government spends 7 trillion dollars a year. That isn't an alarming number.