Is Jeju Island in South Korea cold in winter?

Cold. Jeju Island in South Korea is colder in winter. The average temperature in winter is around 5℃, but sometimes it drops below 0℃. Especially in the mountainous area of Jeju Island, it may snow heavily in winter. The climate of Jeju Island belongs to temperate maritime climate, so it is dry in winter, with more sunny days, but there will also be cloudy days and rainy days. Therefore, if you plan to travel to Jeju Island in winter, you need to take warm measures, especially in mountainous areas and seaside.