Temperatures in Seoul sharply dropped to nearly 1 degree Celsius on Sunday, marking the coldest morning for October in 67 years, the state weather agency said.
The morning low in Seoul came to 1.3 degree Celsius in the day, the lowest since October 13, 1954, when the figure was 1.2 degree Celsius, Yonhap News Agency quoted the Korea Meteorological Administration (KMA) as saying.
Some areas of the capital city saw the mercury drop below zero, and the season's first ice was seen in the city, 17 days earlier than average, it added.
Cold weather also hit other parts of the country, with temperatures on average nationwide falling more than 10 degrees Celsius from a day earlier.
Temperatures on Mount Seorak in Gangwon province plunged to minus 9.3 degrees Celsius in the morning, and the border county of Yeoncheon saw its mercury dive to minus 3.9 degrees Celsius, the agency said, adding that first ice and frost were witnessed across the country.
As of 10 a.m. on Sunday, cold wave alerts, issued for most of the country the previous day, were all lifted.
But the cold snap is expected to continue through next week, according to the agency.
The unseasonable cold wave came as the Arctic chill from the North Pole descends to South Korea and subtropical high pressure goes away, it added.