On the 18th, the last day of the five-day Lunar New Year holiday, the country will be mostly clear. Temperatures will rise during the day, making it feel mild.
Morning temperatures will fall below 0 degrees in most areas nationwide, dropping to around minus 5 degrees in the inland. During the day, they will climb above freezing, with highs forecast between 5 and 13 degrees.
As of 5 a.m. that day, temperatures were minus 0.1 degrees in Seoul, 2.1 degrees in Incheon, minus 2.1 degrees in Suwon, minus 4.5 degrees in Chuncheon, 2.5 degrees in Gangneung, minus 0.7 degrees in Cheongju, 0.3 degrees in Daejeon, minus 1.8 degrees in Jeonju, minus 1.5 degrees in Gwangju, 6.2 degrees in Jeju, 1.7 degrees in Daegu, 3.0 degrees in Busan, 2.6 degrees in Ulsan, and 2.8 degrees in Changwon.
Inland areas of North and South Gyeongsang will see large temperature gaps of 15 degrees or more between day and night.
Gangwon Province will be mostly cloudy at times through the morning, and Ulleung Island and Dokdo will see around 1 mm of rain or snow between morning and midday.
In the snow-covered east coast and mountainous areas of Gangwon, snow that melts during the day may refreeze overnight, creating black ice in some places. Use caution for traffic safety on the return trip.
Fine dust levels will be "good" to "moderate" nationwide as air dispersion improves. However, the Seoul metropolitan area, Yeongseo in Gangwon, the Chungcheong region, Gwangju, and North Jeolla are expected to be "bad" through the morning.
Waves will run 0.5 m to 3.5 m off the east coast, 0.5 m to 2.0 m off the west coast, and 0.5 m to 1.5 m off the south coast.
In the open sea within about 200 km of the coastline, waves are expected at 1.0 m to 3.5 m in the East Sea, 1.0 m to 2.5 m in the West Sea, and 0.5 m to 2.5 m in the South Sea.