What does the first frost represent?

The first frost represents the transition from autumn to winter. The first frost is not frost, but the weather is cold, and the first frost will appear on the earth. The solar terms in the first frost mainly include the customs of enjoying chrysanthemums, eating persimmons, climbing high and overlooking, and tonic. After the first frost solar terms, cold air activities become more frequent, the weather becomes colder, and the temperature difference between day and night becomes larger.

The ancients in China divided the first frost into three stages: jackals sacrificing animals, yellow vegetation and stinging insects. In the first frost season, most parts of the north have entered the autumn harvest, and even cold-resistant onions can't grow again. In the first frost season in the north, the heat dissipates quickly at night, and the temperature will drop below 0 degrees Celsius, so the mellow dew condenses into hexagonal frost flowers, forming the first frost scene before winter. The ancients thought that frost fell from the sky, so they named the solar terms of the first frost as the first frost. In fact, frost, like dew, is condensed by water vapor in the air. Especially when there is no cloud at night, the ground dissipates heat faster and it is easier to frost. There is a saying in the folk proverb that "it will be sunny in first frost, and it will be cool in the snow".