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These include Youngtown, Arizona and Blythe, California, which have each experienced 62 uninterrupted hot days, and Alexandria, Louisiana, and Laredo, Texas, at 54 and 52 days respectively.Ī heatwave is defined as three consecutive days when temperatures reach 90F and above. “This is a bad perfect storm of extreme heat right now,” Ortiz said.ĭozens of cities have had streaks of days with temperatures at 90F and above. These heatwaves follow a rise in temperatures globally due to the burning of fossil fuels. The combination of a heat dome, which traps warm ocean air, and the switch from La Niña to El Niño, a climate pattern that draws in warmer-than-usual waters in the Pacific, is surging temperatures across the world. But as baseline temperatures have been increasing, whenever there’s an event that’s making things hotter, temperatures are going to surpass that 100F threshold more and more frequently.” “These extreme temperatures are not unheard of in those parts of the country. “It’s unfortunately becoming more common,” said Luis Ortiz, climate researcher at George Mason University.

10 area charts of cities across the US with the temperature streaks of 90F days and above