12月7日是大雪节。小雪、大雪是两个表征降雪的节气。若以小雪节为降雪开始日期,大雪节则为积雪开始日期。长江以南的广大地区的平均初雪日期在12月7日之后,即大雪节后,而平均积雪初日在12月22日之后,即冬至节后。东北和西北各地则在11月初,即立冬以前为降雪初日,12月上旬大雪以前为积雪初日。整个华北平原 December 7 is the snow festival. Light snow, heavy snow is two snowfall solar terms. If the snow festival is the starting date for snowfall, the snow festival is the snow start date. The average initial snowfall date in the vast area south of the Yangtze River is after December 7, ie after the Great Snow Festival, while the average snowfall starts on December 22 after the Winter Solstice Festival. The northeast and northwest around the early November, that is, before the beginning of winter snowfall, early December heavy snow before snow first day. The entire North China Plain