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South Korea's Climate: Four Distinct Seasons, Not Just Hot or Cold

Temperate Monsoon Climate — The Full Cycle

South Korea doesn't fit a simple "hot" or "cold" label. It experiences a **humid continental / humid subtropical transition climate** with four sharply defined seasons driven by the **East Asian Monsoon**.

Seasonal Breakdown (Seoul averages)

SeasonMonthsTemp Range (Avg)Character
SpringMar–May10–20°C (50–68°F)Mild, dry, cherry blossoms (early Apr), yellow dust (Hwangsa) from Mongolia/China.
SummerJun–Aug22–27°C (72–81°F)Hot, HUMID, wet. Monsoon (Jangma) late Jun–late Jul: 50% annual rain. Typhoons Aug–Sep. Heatwaves >35°C increasing.
AutumnSep–Nov10–20°C (50–68°F)Crisp, clear, low humidity, spectacular foliage (Seoraksan, Naejangsan). Best travel season.
WinterDec–Feb-2–5°C (28–41°F)Cold, DRY. Siberian high pressure. Snow occasional (more in mountains/east). Wind chill bitter. Heating essential (ondol floor heating).

Regional Variations

  • South Coast (Busan, Jeju): Milder winters (rarely <0°C), hotter summers, less snow.
  • East Coast (Gangneung): Heavy "lake-effect" snow from East Sea.
  • Mountains (Taebaek, Sobaek): Alpine conditions, ski resorts (Yongpyong, Alpensia).

Climate Change Impacts

  • Summer lengthening, winter shortening.
  • Tropical nights (>25°C) increasing.
  • Extreme rainfall intensity up.
  • Sea level rise threatens coastal cities (Incheon, Busan).

So: **Hot/humid summers, cold/dry winters, glorious spring/autumn.** Pack layers year-round.

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