Why is the climate in Kunming so good?

Kunming is located in the middle of Yunnan-Guizhou Plateau, near 25 north latitude. Latitude is in the south, and it takes a long time to get direct sunlight in a year, so it gets more heat. This makes the weather in Kunming have the characteristics of subtropical climate. However, Kunming's high altitude and rising terrain lead to a drop in temperature, which makes Kunming's climate different from the general subtropical climate. Summer is as mild and pleasant as spring. This situation not only exists in Yunnan-Guizhou Plateau in China, but also in other low-latitude plateau areas in the world, such as Mexico City, the capital of Mexico, and Addis Ababa, the Ethiopian capital, also known as "Spring City". Kunming is in the south of China. Generally, the winter wind and cold wave can't affect it here, which is mainly affected by the southwest monsoon. The southwest monsoon slowly sends hot air from the tropical Indian Ocean, which is still warm as spring even in winter. Kunming is in the basin, surrounded by mountains. The whole basin is high in the northwest and low in the southeast. Mountains such as Daliangshan Mountain and Wumeng Mountain are like a huge "wind wall", which blocks the invasion of cold air in the north in winter, making the winter here as blue as washing. Wan Li is cloudless, not frozen, not snowy, and more beautiful than the spring in March in the south of the Yangtze River. It should also be noted that Dianchi Lake in the south of Kunming covers an area of more than 300 square kilometers. Such a large water surface, like a huge "air conditioner", has a certain regulating effect on the temperature and humidity of Kunming, adding infinite spring to the "spring city"