This story was first published by CityLab and is reproduced here as part of the Climate Desk collaboration. America's coasts are melting. California has posted weather warnings for temperatures as much as 20 degrees above average, and yesterday's 97-degree heat in Manhattan demolished a 93-degree record that had stood since 1919. So with the sun turning cheeks the color of tomatoes and crotches into sweat swamps, it's time to ask the question: Is this the hottest day of the year? Depends where you live.