Why can't Chengdu see the sun?

Because of the influence of the Qinghai-Tibet Plateau in the west, the weather in Chengdu is colder than that in the same latitude, and the topography of the Sichuan Basin affects the sunshine far away in Chengdu. For example, in cities with the same latitude, the monsoon climate is remarkable, and the winter is northwest wind [northwest wind is cold and dry]. Chengdu is very cold in winter, and we seldom see the sun.