South Korea in December: what to expect

December is the first full winter month: a dry, cold, continental air mass sits over the peninsula and the monsoon is long gone. Days are short — around 9.5 hours of daylight at the start of the month — and the sun is low, so plan outdoor sights for the middle of the day and keep an indoor backup for late afternoon.

Seoul and the north-west are the coldest of the main stops, with a daytime high near 3 °C and nights around −6 °C; cold snaps can push the morning low to −15 °C or below. Busan and the south-east coast are noticeably milder, rarely far below freezing, which makes Gyeongju, Tongyeong and Ulsan more comfortable than the capital in the same week. Jeju is windy and wet, and Hallasan's summit holds snow. Gangwon is the coldest region and the one place where you want real winter kit.

December sits in the middle of the year for both crowds and prices. The first three weeks are quiet outside the ski resorts: hotels in Seoul are easy to book, palace tickets have no queue, and KTX seats are available at short notice. From about 24 December the picture changes — Christmas Eve and Christmas Day, then the run to New Year, are the busiest stretch of the month, and Seoul hotel rates can double for those nights.

Domestic travel is mostly people heading to Gangwon for skiing and to the east coast for the 1 January sunrise, so ski-area lodges and sunrise spots such as Gangneung and Seongsan Ilchulbong on Jeju fill early. Book ski accommodation and any 31 December–1 January train or bus at least a month ahead; the rest of the month you can decide a few days out.

December's calendar is built around light, snow and the turn of the year rather than big national holidays. Christmas is a public holiday on 25 December and 1 January is New Year's Day; there is no lunar holiday this month, so shops and restaurants stay open through the period.

Seoul's Christmas lights and decorations go up in the main shopping and business districts from late November and stay through the month, and the city's winter illumination displays are the main evening draw. Ski resorts in Gangwon open as snow and snow-making allow, usually from mid-December, and the season runs into February. On 1 January, sunrise crowds gather on the east coast and at Jeju's Seongsan Ilchulbong; expect early buses and a cold wait.

Seoul is the safest base: palaces, museums, markets and the Christmas lights are all within the metro, and you can retreat indoors when the temperature drops. Add a day trip to Suwon for the fortress wall, which is short enough to walk in the middle of the day. If you want milder air, take the KTX south to Busan and Gyeongju, where the same sights are open with less bite in the wind.

For snow, base yourself in Gangwon — Pyeongchang, Sokcho or Gangneung — and ski or snowboard for two or three days. Jeju works in December if you accept wind and rain and skip the summit; the coast and the citrus farms are still open. Daejeon and Ansan are reasonable half-day stops on a Seoul–south route rather than destinations in their own right.

Pack for dry cold, not wet cold. A windproof and water-resistant outer shell matters more than a bulky coat, because the wind is what makes Seoul feel far colder than the thermometer suggests. Layer a thermal base, a fleece or light down mid-layer, and the shell; add gloves, a hat that covers the ears, and a scarf for the evening. Warm, grippy boots with room for thick socks are the single most useful item if you plan any walking or skiing.

Bring lip balm and hand cream — indoor heating is dry — plus a power bank, since cold drains phone batteries quickly. If you are skiing, rent skis, boots and a helmet at the resort and bring only goggles, gloves and a warm mid-layer. A small day bag for the indoor/outdoor switch and a refillable bottle for hot drinks complete the kit.

November is the shoulder: autumn colour in Seoul's palaces early in the month, then the cold arrives, with medium crowds and prices. January is colder but dry and cheap, and it is the peak of the ski season; Seollal can fall late in the month, so check dates before booking. February is the coldest stretch in many years and Seollal shuts shops for about three days — check the lunar calendar. October is the strongest alternative if you want clear skies and autumn colour instead of winter.