Why is this October especially warm?

With the recent exceptionally mild weather, it's difficult to think that winter is only around the horizon. The cold weather usually arrives in mid-November, but the country is experiencing its hottest November in a decade.

Tuesday was "Soseol," which means "little snow" in Korean and is one of the old Korean lunar calendar's 24 seasonal divisions. The first snow of the season happens at this time of year,....