Why is China hotter than the United States?

Wrong, China as a whole should be colder than the United States. Generally speaking, the coldest northeast and Xinjiang in China, as well as Inner Mongolia, are much colder than the northernmost places in the United States. In the coldest place in the United States, the temperature is rarely below-15 degrees in winter, while in the United States, except for some areas in the north, it seems to be very cold in winter, and many areas in the south are particularly hot or not. Unlike the south, although it is very hot in summer, it will also be greatly affected by cold air in winter. Even in Tennessee and Atlanta, which are slightly south of the central part of the United States, it is extremely hot for most of the year, and the degree of heat will never be lower than that in southern China, because the main heating air masses in the United States in summer are stronger than Chinese mainland, such as the Gulf Stream, the Atlantic Stream and the warm and humid airflow in the eastern Pacific Ocean, and it seems that there are hurricanes and subtropical high in the United States, so it is hotter than that in southern China. If you don't believe me, you can go to Sina Weather Online to check the meteorological historical data records of those cities in the United States, and you will know that the only place with a good climate in the United States is California. Basically, the temperature has not changed in one year, that is, the temperature in spring and autumn has remained unchanged in winter and summer. The climate in other areas has some disadvantages. Tell a story and get to know Yao Ming, who is from Shanghainese, China. Shanghai is very hot in summer, but he didn't know what the real heat is until he arrived in Houston, USA. It is much hotter in Houston than in Shanghai. It is said that it is hot in Houston and much hotter in winter than in Guangdong, China. In Guangdong, China, it's occasionally cold in winter, but it's usually warmer. Houston residents said after watching a documentary that the hot weather will last until Christmas. I watched the weather on Sina. Because there are five lakes in the north of the United States and rivers and lakes in Canada, it is the country with the richest water resources in the world. Therefore, when the polar cold air mass passes through so many lakes in winter, the temperature will rise a lot, and everything in the United States is coastal, and the airflow on the ocean will also limit the power of cold air. Moreover, the terrain and mountains in the United States are north-south, which means that the air flow in the north-south direction will hardly be hindered, so even if there is cold air in winter, the warm and humid air flow in the south will drive directly into the north, so it is not as cold as China in winter. The coldest northern part of the United States should be a little colder than China and North China, then it should be Canadian, and it should be much warmer than Siberia in the north of China, while the climate in the central part of the United States should be close to that in the south of China. The heat in the south can't be compared with that in the south of China, because there is no obstacle from cold and warm air, it is only occasionally cold when cold air mass comes to the south in winter. I have read the historical materials of many cities in the southern United States. In many summers, the average maximum temperature is 35 to 40 degrees. Almost every state in the south is almost so hot from west to east, and the summer is still very long. Because there are many lakes in the north, the cold air in winter is wet and cold, and it is easy to collide with the warm air in the south. So it snows much more in the United States than in China, and it is much colder in China. Because China is dry and cold with little water vapor, it seldom snows. However, the climate in the United States is not like that in China. The weather is absolute all year round, that is, the rhythm of almost every province is the same. The climate in the United States is much more complicated than that in China, so we can't generalize.