Is there a big difference between the weather in Shanghai and Chengdu?

Well, Shanghai is hotter than Chengdu in summer and rainy in winter, but there are many more sunny days than Chengdu all year round. The air quality is better than Chengdu.

There are many rainy nights in spring and autumn in Chengdu. It hardly wets clothes when it rains in winter, and it is wet in winter. It's all cloudy or almost no sun. The polluted weather in the whole year often ranks first in the country.