What's the difference between the climate in Shanghai and Changsha?

Shanghai is located along the coast and has a strong maritime climate. Compared with Changsha (inland relative to Shanghai), the relative latitude is similar, the temperature difference is smaller and the precipitation is relatively more. In addition, Shanghai has an open terrain, and Changsha is located in the Xiangjiang River Valley, so it is not easy to dissipate heat, so Changsha is hotter in summer, so Changsha is called a stove, but Shanghai does not (including precipitation, typhoon, summer drought and other factors). In winter, the temperature in the two places is similar.