 are there in urban heat islands as opposed to the rest of the city? So say Chicago's lakefront is at 80 degrees. How bad is it in an urban heat island area in that city? It could be 10, 12 degrees higher. And really, the whole city overall tends to be a good 5, 6 degrees warmer than the suburban areas. But the most extreme urban heat islands could be 10 to 12 degrees higher. So yeah, if you're looking at an 80-degree day, that's pushing it above 90 in those neighborhoods.