How Hot Can It Get, Literally? Scientists Weigh In

Four years of research following the 2021 western North American heat wave has revealed both the meteorological conditions that fuel extreme temperatures and evidence that heat has physical limits. The 2021 event "shocked everyone, including specialists working on the subject. People were completely stunned," said Robin Noyelle, a postdoctoral researcher in climate science at ETH Zurich. Scientists now focus on temperature departures from local averages rather than absolute readings. The most anomalously warm temperature was recorded in Antarctica, where temperatures rose 39C above average in March 2022. North Pole temperatures surged 20C higher than normal in February, reaching the melting point in winter. Research has identified five key factors that enable extreme heat: cloudless skies, high pressure, dark surfaces, lower altitudes, and lack of water. "Basically all of these conditions are met in Death Valley, but not in many other places in the world," said climate scientist Friederike Otto. Scientists insist that there are heat limits, though these upper bounds will rise with global warming, they caution.

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