For generations, the calendar offered a kind of thermal contract: summer brought the heat, and the turning of seasons brought relief. A new study now documents the quiet dissolution of that agreement — dangerously hot days are migrating into spring and autumn, and heatwaves are intensifying faster than global warming itself would predict. What was once a seasonal hazard is becoming a year-round condition, demanding that societies rethink not just how they respond to heat, but when.
Study warns extreme heat is expanding beyond summer into spring and fall
Dangerously hot days pose direct health risks to populations, with potential for heat-related illness and mortality.