Why is it always hot in Shenzhen?

Shenzhen is located in the tropics, except the Tropic of Cancer, which belongs to the tropics, but it has a subtropical maritime climate.

The National Center for Atmospheric Research recently released a research report, saying that the tropics have advanced about 280 kilometers to the north. This means that Shenzhen bid farewell to the tropical edge and entered the depths of the tropics.

The person in charge of the Forecast Department of Shenzhen Meteorological Bureau responded that the meteorological factors such as the rising temperature year by year and the obvious reduction of air relative humidity have indeed cast some "tropical" climate colors on Shenzhen, which originally belonged to the subtropical climate. However, the statement that Shenzhen is tropical has not been confirmed by the authoritative International Meteorological Organization, and there is no conclusion yet.