freezing line

Europe’s high-alpine zones just experienced something that’s never happened this early in the year: temperatures above freezing at nearly 5,250 meters (17,200 feet). In a record-shattering heat event, the “thermal zero”—the elevation where temperatures in Celsius drop below freezing—climbed to its highest ever recorded level for the month of June. On June 28, a Swiss weather station in Payerne measured the […]