The Weather Extremes Index
Daegu led the observed Korean cities with 54 heatwave days in 2025, according to KMA surface synoptic (ASOS) daily observations.
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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