More than half of Chicagoans live in areas that feel at least 8 degrees higher than the actual temperature.
The big picture:Urban heat islands (UHI) are boosting temperatures within 65 major U.S. cities that are home to 50 million people, or 15% of the total U.S. population, according to Climate Central's analysis.
How it works: Heat islands are created when roads, buildings, parking lots and so on "trap" heat.
Often such neighborhoods lack trees and plants that would help cool the area.
By the numbers: Neighborhoods with a UHI index of 10 degrees or higher are in all parts of the city, including Streeterville, River West and near Midway Airport.
Parts of the South Side, including South Deering, West Pullman and Morgan Park have a UHI between 7 and 8 degrees.
The lowest UHI in the city is a 6-degree index around O'Hare.