Icicles are seen on a man's eyebrows in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week. (Photos: Xinhua)

Dancers doing a musical video shiver in frigid temperatures in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

A family sets up a portrait in frigid temperatures in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

A couple walks along snow-covered Montrose Beach in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

A man jumps down onto a snow-covered beach in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

A winter swimmer jumps into Lake Michigan in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

People walk along snow-covered North Ave. Beach in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

The North Ave. Beach is seen in frigid temperatures in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

A woman poses for a photo in frigid temperatures in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.

People walk along snow-covered North Ave. Beach in Chicago, the United States, on Feb. 7, 2021. The Chicago area in the United States is entering a cold spell Sunday, which is expected to last a week.