By the 2090s, summer heat waves could kill an average of 7,370 people each year in New York alone. Philadelphia, Chicago and Boston would also be hit hard under a business-as-usual emissions scenario, with 5,040, 2,440 and 1,340 annual deaths, respectively.
Article source: http://www.huffingtonpost.com/entry/extreme-heat-deaths-american-cities_us_59540b89e4b02734df2fae25?section=us_new-york