Is Extreme Weather Getting Worse? What the Data Shows

The short answer is yes, and the data is unambiguous. The number of weather-related disasters costing over $1 billion has increased from an average of 8 per year in the 1980s to over 25 per year in the 2020s in the United States alone. Globally, flood events have doubled since 2000, major wildfires have tripled in area burned, and heat waves have become 5 times more frequent. The physics is straightforward: a warmer atmosphere holds about 7% more water vapor per degree Celsius of warming, leading to heavier rainfall and more intense storms.

At the same time, higher temperatures increase evaporation, deepening droughts in arid regions. Hurricane intensity has increased measurably: category 4 and 5 storms are 25-30% more frequent than in the 1970s, though the total number of storms has not changed significantly. The cost of weather disasters now exceeds $300 billion per year globally, a fourfold increase since 1980 even after adjusting for inflation and development. Insurance markets are feeling the strain: California insurers have dropped 500,000 homeowners policies since 2020, and Florida property insurance premiums have doubled in five years.

Attribution science can now quantify the climate contribution to individual events: the 2023 Canadian wildfires were made at least 7 times more likely by climate change..