OPDADA · Korea Guide

Korea in December: What to Expect and How to Plan

Weather normals · winter festivals · ski opening · Dec 25 and New Year · air quality

December is the first full month of winter in Korea. Seoul is heading into its coldest stretch of the year, the city centre fills with light installations, the ski resorts in Gangwon have usually just opened, and December 25 is a public holiday. It is also the month when the government's seasonal fine-dust controls begin. This guide covers what the official data and organisers actually say, so you can pack and plan without guessing.

For clothing and day-to-day survival in the cold, see /guide/korea-winter-survival. For light festivals in detail, see /guide/korea-winter-lights, and for skiing, /guide/korea-ski-guide. This page is the month-level overview.

December weather in Seoul (climate normals)

The Korea Meteorological Administration (KMA) publishes 30-year climate normals for 1991–2020. For Seoul, the coldest month is January, with a mean of −1.9°C; December is the run-up to it. For December-specific temperature figures, check the KMA climate normals for your dates. Winter (December–February) is the dry season: the three months together average only 67.6 mm of precipitation, about 5% of the annual total. Seoul's average first snow date is November 20, so light snow in December is normal, but heavy accumulation in the city is not the default.

Seoul, winter (KMA normals 1991–2020)Value
Coldest month (January) mean temperature−1.9°C
Winter (Dec–Feb) precipitation total67.6 mm (about 5% of the year)
Average first snowNovember 20

Two practical notes. First, averages hide the swings: Korea gets cold waves driven by continental air, and a single week can be far colder than the numbers above. Second, the east coast, Gangwon mountains and Jeju behave differently from Seoul (mountain areas get much more snow), so check the KMA forecast for the specific place you are going.

Cold-wave and heavy-snow alerts: what the levels mean

KMA issues official alerts, and Korean apps and news will show them. The thresholds are public:

A cold-wave advisory in Seoul is not rare in December or January. When one is issued, expect icy pavements. A heavy-snow warning in Gangwon can close mountain roads and delay intercity buses, so build slack into ski-trip days.

What to wear

Plan for cold, dry air and long stretches indoors with strong heating. A windproof outer layer, a warm mid-layer, a hat and gloves, and shoes with grip cover most days in Seoul; add real insulation for Gangwon or for standing outdoors at night events. The full packing list, including what to buy locally (heat packs, masks, lip balm) is in /guide/korea-winter-survival, and the year-round packing logic is in /guide/seasons-and-packing.

December events: lights, markets, countdown

Seoul's main winter programme is the Seoul Winter Festa, run by the city government. The 2025 edition ran from December 12, 2025 in the downtown area, with these components (check the official site for admission):

The city reported more than a million visitors to the market and lantern festival in the first three days (December 12–14, 2025), so evenings and weekends are crowded. Dates for the 2026–27 season are normally announced by the Seoul Metropolitan Government in late autumn; the pattern has been a mid-December start running into early January. Check the official Seoul site before you fix a date, and see /guide/korea-winter-lights for Busan and other cities.

New Year's Eve in Seoul: transport runs late

For the 2025 Bosingak ceremony the city extended Seoul subway lines 1–9 and two light-rail lines so that last trains ran until 2:00 AM on January 1. Jonggak Station on Line 1, directly under the bell pavilion, was bypassed from 11 PM on December 31 to 1 AM on January 1 to manage crowds, and 47 bus routes were detoured. If you go, use a neighbouring station (Jongno 3-ga, City Hall, Euljiro 1-ga) and expect the same pattern, but confirm the year's notice on the Seoul Metropolitan Government site.

Ski season starts

Korea's ski resorts are concentrated in Gangwon (Pyeongchang, Jeongseon, Hongcheon, Hoengseong, Taebaek, Chuncheon, Wonju), with two close to Seoul in Gyeonggi (Icheon and Gwangju) and one in Muju, Jeonbuk. The Korea Tourism Organization lists the peak season as December to February and advises booking accommodation and shuttle buses ahead. For 2025–26, resort opening dates fell in late November to mid-December (KTO), and High1 in Jeongseon opened on November 28, about a week earlier than in previous years, starting with a beginner slope and sledding area before opening all 15 slopes in sequence.

So by early-to-mid December most resorts are open, but in the first weeks only part of the mountain may be running on artificial snow. Opening dates for 2026–27 had not been announced when this page was checked; they depend on temperatures and snowmaking and are published by each resort in November. Details on getting there, lift passes and rentals are in /guide/korea-ski-guide.

December 25 and the New Year: what is open

Christmas Day (December 25) is an official public holiday in Korea, and so is January 1. December 31 is not a holiday. The Korea Tourism Organization's guidance for public holidays is that government offices and banks close, while palaces, museums, department stores and amusement facilities stay open. Book ahead if you have a specific restaurant in mind for December 24–25.

Korea's main family holiday is Seollal (Lunar New Year), not January 1. Seollal follows the lunar calendar and lands in late January or February, so the December 31 – January 1 period does not bring the nationwide shutdown that Seollal does. Expect a normal one-day holiday on January 1 with the usual public-holiday pattern above. Payment and cash questions for holiday periods are covered in /guide/money-and-payments.

Prices and crowds: late December

The end-of-year stretch includes two Korean public holidays, December 25 and January 1. Check fares and hotel rates for your dates rather than assuming; if you travel in the last week of the year, book flights and central Seoul hotels early. See /guide/where-to-stay for areas and /guide/incheon-airport-to-seoul for late-night arrival options.

Air quality: the fine-dust season begins

December is the start of Korea's seasonal fine-dust management period, which runs from December to March (Seoul's own seasonal measures, announced in 2019, ran December 1 to March 31). It has operated every winter since 2019 and tightens emission controls on vehicles, power plants and industry because winter and spring bring westerly winds, stagnant air and little rain. For 2025–26 the Climate, Energy and Environment Ministry set a target of cutting ultrafine dust and precursors by 2% from the previous year and lowering the national average PM2.5 level by 5%.

For a traveller this means: December is usually better than March, but hazy days do happen. Check the daily index before long walks or outdoor events with the /tools/air-quality checker, and carry a KF94 mask (widely sold at convenience stores and pharmacies) for bad days. If you have asthma or a heart condition, follow your own doctor's advice on high-dust days.

A simple December plan

  1. Book flights and a central hotel as early as you can if you travel after December 20.
  2. Pack for around-freezing days and heated interiors; buy heat packs locally.
  3. Put the Seoul Winter Festa evenings on weekdays to avoid the worst crowds.
  4. If skiing, go mid-December or later and check the resort's own site for which slopes are open.
  5. Confirm the Bosingak transport notice before New Year's Eve and avoid Jonggak Station.
  6. Check air quality each morning; mask up on bad days.

FAQ

Q. How cold is Seoul in December?
KMA's 1991–2020 normals give January as Seoul's coldest month, with a mean of −1.9°C; December leads into it. Check the KMA climate normals for December-specific figures. Cold waves can push single days far below the averages.

Q. Does it snow in Seoul in December?
Light snow is normal (Seoul's average first snow is November 20), but winter is the dry season, with only 67.6 mm of precipitation across December–February. Heavy snow is more typical of Gangwon's mountains than of central Seoul.

Q. Is Christmas a holiday in Korea?
Yes. December 25 is an official public holiday, and so is January 1. Banks and government offices close; department stores, palaces, museums and amusement facilities generally stay open.

Q. When do Korean ski resorts open?
For the 2025–26 season, opening dates fell in late November to mid-December (KTO), with High1 opening November 28. Dates change each year with temperatures and snowmaking, and each resort announces its own in November.

Q. When are the Seoul winter lights on?
The 2025 Seoul Winter Festa started December 12, 2025, with the Lantern Festival running to January 18, 2026 and Seoul Light Gwanghwamun to January 4, 2026. Future dates are announced by the city; the pattern is a mid-December start.

Q. Is air pollution bad in December?
December is the first month of the seasonal fine-dust management period (December to March). Levels are usually lower than in March, but hazy days occur; check the daily index and carry a mask.

Sources

Written and maintained by OPDADA · Last checked 2026-08-23 · Spotted an error? Let us know. This page is general information, not legal, tax or financial advice. Rules, prices and schedules change — confirm with the official source before you act.