What is the difference between Nanchang and Chongqing?

Absolutely no problem. Nanchang is short in spring and autumn and long in summer and winter. Although the four seasons are different in length, the seasonal characteristics are obvious: warm and humid in spring, hot and rainy in summer, cool and dry in autumn and cold and little rain in winter. It's similar to yours. Don't worry. It rained in Mao Mao these days, and it was very cold, about 18 degrees. It will still rain in the next few days. Pay attention when traveling. I wish you health and happiness!