What do you mean, Chongyang is three feet cold?

The climate of the Double Ninth Festival is very cold. The Double Ninth Festival is the ninth day of the ninth lunar month and one of the important traditional festivals in China. According to the observation of the ancients, the cold of the Double Ninth Festival in 1999 has begun to be threatening, and three feet of cold means that the weather is already very cold. This sentence is often used to describe the feeling of sudden drop in temperature and cold in autumn.