These giant swings in temperature over short distances in cities, known as the urban heat island effect, make heat waves even worse.

Nine cities are home to at least 1 million people who live in neighborhoods that climb 8 degrees higher than surrounding areas.

Nearly 3.8 million New Yorkers, for example - 41% of the city’s population - faced temperatures at least 10 degrees Fahrenheit hotter than the city’s official readings, Climate Central found. The analysis also found even more intense urban hotspots where temperatures are at least 10 degrees Fahrenheit higher than the rest of the city. More than 1.3 million residents in Phoenix are exposed to these higher temperatures.

Phoenix is one of nine cities where at least 1 million people live in neighborhoods that climb 8 degrees higher than surrounding areas, the Climate Central analysis showed.

And Phoenix, one of the hardest-hit cities in this summer’s scorching heat, is in its fourth week in a row of high temperatures over 110 degrees, smashing a previous record of 18 straight days. “But even when cities and neighborhoods have similar population densities, development patterns and materials allow some to get much hotter than others.”Įxtreme heat has gripped the country’s southern tier from Southern California to Florida since June. Florida ocean temps surge to 100 degrees as mass coral bleaching event is found in some reefs

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