木枯らし

Kogarashi (木枯らし) is a Japanese word for a particular wind: ko ('tree') and garashi ('to wither or strip'). It is the specific first bitter cold wind of late autumn that strips the last leaves from trees and signals the start of winter. Not just any cold wind. Not winter generally. The precise wind at the precise moment when the season turns.

Japanese people have lived with seasonal shifts for centuries. The monsoon is one wind. The summer breeze is another. But kogarashi is the one that marks the transition—the wind that kills the remaining leaves and makes you understand that warmth is finished. The word carries that transition in its name: tree-withering, the wind that ends green things.

Japan's Japan Meteorological Agency (established in the Meiji period) formalizes the concept. Each year, meteorologists announce when the kogarashi has officially arrived in different regions of Japan. The announcement is treated as an important date. Schools note it. News outlets report it. The season has officially shifted.

In modern Japan, kogarashi appears in daily conversation, in poetry, in seasonal dictionaries. It is not poetic or metaphorical—it is a real, observable phenomenon that occurs on roughly the same date each year. The word is so precise that many non-Japanese languages don't have a translation. You'd have to explain it in a full sentence in English.