Where is it warm in winter in Yantai, Dalian?

Same. Both Dalian and Yantai belong to warm temperate continental monsoon climate, and the winter is equally cold, depending on the weather forecast. Dalian, also known as Binhai City and Romantic City, is a prefecture-level city, sub-provincial city, city with separate plans and megacity under the jurisdiction of Liaoning Province, an important central city, port and scenic tourist city in the northern coastal area of China, and a central city in the coastal economic belt of Liaoning Province.