Why is it so hot in summer in Hebei, Beijing, Tianjin, Shanxi and Henan?

Because of the long sunshine time, the drought in this part of the region is more serious, and there are fewer rainy days in summer. Long hours of sunshine every day lead to hot weather. At the same time, there is little water and vegetation in these areas, and the temperature regulation ability is poor. Moreover, these areas have high population density and stronger urban heat island effect. To sum up, this part of the area is hot.