Why does the summer sun in the United States feel more sunny than in China?

The intensity of solar radiation in a place is related to the latitude of this place. It is obvious in high latitudes and low latitudes. The high latitude area is the low latitude area in the north and south poles or near the equator. This is often said that the higher the position, the colder it is and the lower the latitude. If you want to eat the sun there, you will get farther than the North and South Poles, so the more heat you generate, the more you will get.