The Weather Extremes Index
Korea’s hottest, wettest and coldest cities in 2025 — computed from the KMA’s official daily observations at 16 stations. Locals call Daegu “Daefrica”; the heatwave tab is that joke, measured.
Source: KMA surface synoptic (ASOS) daily observations (기상청 지상(종관, ASOS) 일자료) — Korea Meteorological Administration (기상청). Year 2025 · 16 ASOS stations · KMA official thresholds. Retrieved 2026-08-29.
Days with a high of 33°C or above — the KMA's official heatwave threshold.
- 1Daegu대구54days
- 2Cheongju청주48days
- 3Jeonju전주48days
- 4Daejeon대전44days
- 5Gangneung강릉43days
- 6Pohang포항43days
- 7Gwangju광주41days
- 8Chuncheon춘천32days
- 9Jeju제주31days
- 10Seoul서울28days
- 11Ulsan울산28days
- 12Suwon수원17days
- 13Mokpo목포17days
- 14Busan부산16days
- 15Incheon인천11days
- 16Yeosu여수3days
Practical takeaways
- The mildest summer of 2025 — counting heatwave days plus tropical nights — was Chuncheon, with 32 and 5 respectively (the harshest, Jeju, had 31 and 68).
- The mildest winter was Jeju — 0 cold-wave days, 17.7°C annual average.
- The driest city was Pohang (1,013mm for the year); the wettest was Gwangju (1,975mm).
Computed only from the table above — nothing added from outside this dataset.
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