Dallol, Ethiopia is the hottest place on Earth based on year-round averages, which is to say that if you average the temperature of every place on Earth for one year, Dallol's average will be the highest. There are places in the world that are hotter at given moments but Dallol is the hottest on average.
Another thing that makes Dallol so hot, its high humidity (around 60 percent) and the noxious fumes that rise out of its Hades-looking sulfur pools notwithstanding, is the fact that it doesn't cool off at night. While many of the world's hot spots are located in deserts, where temperature extremes between day and night are just as dramatic as the extreme temperatures experienced during either, Dallol has an average low temperature of 87 degrees Fahrenheit, which is hotter than many places on Earth ever get.
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