What do you mean when you come to Yanmen in August and the geese have frost on their feet?

In August, geese come to Yanmen with frost on their feet. In August of the lunar calendar, geese begin to move south, and the first frost is coming.

This sentence comes from "Folk Songs". "When geese come to open the door in August, their feet are covered with frost", which means that in August of the lunar calendar, geese begin to move south, and the first frost comes when geese fly over. This sentence depicts the southward migration of geese and the seasonal changes of the first frost, reflecting people's profound understanding of the laws of nature. This "folk song" is a climate change phenomenon summarized by farmers themselves and has been passed down from mouth to mouth. This sentence not only depicts the scene of geese moving south, but also indicates the arrival of the first frost, expressing people's awe of nature and love for life.