Sun Jan 18 11:50:00 UTC 2026: ### Headline: Weather Fluctuations Expected Across Korea: Warming Trend Followed by Sub-Zero Temperatures and Snow

The Story

On Sunday, December 18th, South Korea will experience a relatively mild day with temperatures above average before cloud cover increases in the afternoon. Parts of Gangwon province will see rain or snow overnight. However, a significant shift is anticipated for the following week. Beginning on Tuesday, December 20th, coinciding with Daehan, traditionally the coldest period of the year, a cold front will bring sub-zero temperatures nationwide, with some regions expected to drop to -10°C or lower. This cold snap will be accompanied by strong winds, further lowering the perceived temperature. Intermittent precipitation is expected in specific regions like Jeolla and Jeju, as well as Gangwon, mid-week. While temperatures will gradually rise towards the end of the week, morning lows will remain below freezing. Dry conditions in eastern regions pose a persistent fire risk.

Key Points

  • Sunday, December 18th: Mild temperatures above average, increasing cloud cover, possible rain/snow in Gangwon.
  • Monday, December 19th: Cloud cover across the nation, rain or snow in Gangwon expanding to other central regions, scattered precipitation in Seoul, Incheon, and Jeonbuk.
  • Tuesday, December 20th: Sharp drop in temperatures, nationwide cold wave with lows around -10°C, strong winds.
  • Wednesday, December 21st – Thursday, December 22nd: Precipitation expected in Jeolla, Jeju, and Gangwon Yeongseo.
  • Friday, December 23rd – Sunday, December 25th: Generally clear skies, gradually rising temperatures, but morning temperatures remain below freezing, dry conditions persist in eastern areas.
  • A wind wave advisory has been issued for the outer sea in the southern part of the East Sea.
  • Fine dust levels are expected to be “good” to “average” during the week.

Key Takeaways

  • Korea will experience a significant temperature swing, transitioning from relatively mild conditions to a severe cold wave within a few days.
  • The anticipated cold snap coincides with Daehan, highlighting the traditional accuracy of seasonal forecasting.
  • The combination of dry conditions in eastern regions and potential increased fire risk is a significant concern that needs attention.
  • Travelers and those engaged in maritime activities should be aware of the wind wave advisory.
  • Citizens are advised to take precautions against both the cold and potential safety hazards related to melting ice during the initial warmer period.

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