An African penguin swims in their enclosure at the Franklin Park Zoo in Boston to cope with the hot weather conditions, Thursday, July 2, 2026. (AP/Michael Casey)

Zookeeper Brooke Cannon provides a Dexter steer at the Franklin Park Zoo in Boston, Thursday, July 2, 2026, with a block of ice containing apple slices, bananas and pears to help it keep cool amid the heat wave. (AP Photo/Michael Casey)

A pygmy hippopotamus wallows in the water in their enclosure at the Franklin Park Zoo in Boston to cope with the hot weather conditions, Thursday, July 2, 2026. (AP/Michael Casey)

A man plays Frisbee with friends in the Sheep Meadow of New York's Central Park, Thursday, July 2, 2026. (AP Photo/Richard Drew)

A man takes advantage of a sprinkler during hot weather in New York's Central Park, Thursday, July 2, 2026. (AP Photo/Richard Drew)

Ruth, 11, from Burke, Va., gets cold water poured on her head to cool off at the Great American State Fair on the National Mall, Thursday, July 2, 2026, in Washington. (AP Photo/Alex Brandon)

Mickelina Papotto, of Salem, Ore., left, and Lorie Odegaard, of Gaithersburg, Md., fan themselves while waiting in line for the ferris wheel at the Great American State Fair on the National Mall, Wednesday, July 1, 2026, in Washington. (AP Photo/Jacquelyn Martin)

A vendor pulls out a bottle of water from a tank using dry ice to keep it cold, during a heat wave at the Great American State Fair on the National Mall, Thursday, July 2, 2026, in Washington. (AP Photo/Alex Brandon)