Weather | 3°C to 5°C by day, colder after dark, with occasional light snow | Around -6°C to 2°C, usually dry, sharp wind, coldest feel of the season | Around -4°C to 5°C, still cold, but slightly easier by late month |
Crowds | Moderate to high near Christmas and New Year's | Low to moderate after the first weekend | Low to moderate, with a bump around Seollal |
Atmosphere | Holiday lights, markets, and year-end mood | Quiet, practical, local, and good for slow winter days | Holiday traditions, first hints of spring, and family travel around Lunar New Year |
Key events | Lantern displays, Christmas markets, New Year's Eve countdown | Bosingak Bell Ceremony, Seoul Lantern Festival tail end, Korea Grand Sale, ice rink season | Seollal events, Korea Grand Sale final weeks, first plum blossoms |
Public holidays | Christmas Day, year-end travel period | Jan 1 holiday effect; otherwise fewer closures | Seollal period can bring short closures and transport pressure |
Best for | Holiday lights, festive trips, end-of-year energy | Cheap-ish city breaks, indoor sightseeing, clear observatory views | Cultural holiday events, light winter travel, early seasonal change |
Book early? | Yes for Dec 20-31 | Only for Jan 1-5, weekend observatories, and popular shows | Yes for Seollal dates and holiday weekend transport |
Transport tips | Heavy foot traffic around major markets and countdown areas | Subway is smooth; icy pavements matter more than traffic | Expect fuller trains and buses around Lunar New Year travel dates |