Is there really no spring and autumn in Nanjing?

Personal feeling: spring and autumn in Nanjing add up to more than a month at most, which is too short for people to feel. After winter, they will go to summer. People who wear sweaters today will want to wear shirts tomorrow. After the summer, they will enter the winter, the temperature will drop at night, and they will have to wear shirts the next day. Nanjing is called the Stone City, and the underground is mostly stone. The temperature drops quickly and heats up quickly.