Prep
Korea weather in December: how cold it gets, what Koreans wear (Updated Nov 11, 2026)
Seoul in December averages −3.4°C to 4.2°C with about 6 snow days. Official numbers for 4 cities, the 2026 outlook and the 4-layer way Koreans dress.
Topic
Before you go
Everything to sort out before you fly to Korea: K-ETA and entry rules, the weather by season, cash and cards, eSIM or pocket Wi-Fi, and what to pack. Entry rules change often, so every article shows the date its facts were checked.