Isn't Seoul maritime? Why is it so cold?

Seoul (Hanyang), which is now Seoul (Seoul in English, because it is located in the Hanjiang River basin), belongs to the temperate monsoon climate. During the reign of Lee Myung-bak in 2005, in order to eliminate the influence of China culture, the South Korean government announced that the Chinese translation of the English word "Seoul" in Seoul would be changed to "Seoul". The annual average temperature is about 1 1.8℃, with four distinct seasons. There is little rain and warm climate in spring and autumn, which is suitable for traveling. In summer (from June to mid-September), the average monthly temperature is 20℃- 27℃, which is continuous high temperature and rainy weather. In winter (65438+February ~ February), the temperature is slightly lower than other cities in the same latitude. (The monthly average temperature is -5℃~0℃). South Korea is surrounded by water on three sides, so the climate is maritime. Even if it is attacked by strong cold air in winter, the temperature change range is low.