People enjoy themselves at the Crown Fountain in Millennium Park of downtown Chicago, the United States, July 5, 2019. The temperature in Chicago on Friday reached 33 degrees Celsius.

People enjoy themselves at the Crown Fountain in Millennium Park of downtown Chicago, the United States, July 5, 2019. The temperature in Chicago on Friday reached 33 degrees Celsius.

People enjoy themselves at the Crown Fountain in Millennium Park of downtown Chicago, the United States, July 5, 2019. The temperature in Chicago on Friday reached 33 degrees Celsius.

People enjoy themselves at the Crown Fountain in Millennium Park of downtown Chicago, the United States, July 5, 2019. The temperature in Chicago on Friday reached 33 degrees Celsius. (Photos: Xinhua)

People enjoy themselves at the Crown Fountain in Millennium Park of downtown Chicago, the United States, July 5, 2019. The temperature in Chicago on Friday reached 33 degrees Celsius.

People enjoy themselves at the Crown Fountain in Millennium Park of downtown Chicago, the United States, July 5, 2019. The temperature in Chicago on Friday reached 33 degrees Celsius.