approach of winter; approaching the coldest time of the year
Formal, literary term used mainly in letters to refer to the deepening of winter. Often appears in seasonal greetings.
See also: 向暑
As winter approaches, please take care of yourself.
向寒の候、皆様のご健康をお祈り申し上げます。
In this season of deepening winter, I wish you all good health.