Climate Change’s Shrinking Window for Record Marathon Performances
Athletes take part in the Marseille-Cassis Classique Internationale, a 20km half-marathon race, in Marseille on October 26, 2025. — AFP KARACHI: Climate change is rapidly shrinking the window of “cool days” that allow marathon runners to perform at their best, posing a growing challenge to athletes and organizers of the world’s top long-distance races, a new scientific analysis has warned. The report, titled “Running Out of Cool Days: How Climate Change Reduces the Chances of Optimal Marathon Conditions,” was released by Climate Central ahead of the New York City Marathon. It examines how rising global temperatures affect marathon performance conditions









