The data’s in for 2025. It was yet another year of back-to-back billion-dollar weather and climate disasters in the U.S.

Unseasonably high temperatures have swept across South Korea and Japan, contributing to dangerous wildfire conditions from March 21, 2025, to March 26, 2025. Human-caused climate change has ...

Daily average temperatures reached Climate Shift Index (CSI) levels of 5 in central Canada from May 26 to May 29, 2025. A CSI level 5 indicates that human-caused climate change made this heat at least ...

Click the downloadable graphic: Local Extremely Hot Summer Days at CSI 2 or Higher Levels of planet-warming CO2 in the atmosphere surged in 2024, growing at the fastest annual rate on record. The ...

The Climate Shift Index (CSI), Climate Central’s daily temperature attribution system, applies the latest peer-reviewed methodology to map the influence of climate change on temperatures across the ...