What happened to the first frost after the Double Ninth Festival?

After the first frost double ninth festival, the temperature gradually dropped and the weather became cold, accompanied by a series of special natural phenomena.

difference in temperature

The first frost is one of the 24 solar terms in China, marking the end of autumn and the arrival of winter. After the Double Ninth Festival, due to the reduction of sunshine time in the northern region, the temperature gradually dropped, and the temperature began to drop significantly. The temperature during the day will also be significantly lower than before, and the temperature difference between morning and evening will be greater. People need to add clothes to keep warm.

Frost appeared.

As the temperature dropped, frost began to appear. Frost refers to the process that water vapor directly changes from gas to solid in an environment close to 0 degrees Celsius, that is, water vapor condenses into dew and forms ice crystals on the ground, plants and other surfaces. Frost usually occurs in the early morning or at night, especially in areas with clear skies and high humidity.

Plants go into a dormant state.

After the first frost, the plants gradually entered the dormant period. With the decrease of temperature, the metabolism in plants slows down, and the growth activities stop or decrease obviously. Leaves gradually turn yellow and fall, and branches gradually wither. This is to keep the plants alive in the cold winter and prepare for the next spring to start growing again.

Farmland began to lie fallow.

After the first frost, the farmland also entered the fallow period. Due to the cold weather, the growth rate of crops slowed down or even stopped. Farmers will harvest the crops planted in autumn, clear the fields and carry out basic soil management to prepare for sowing and farming in the coming year. At this time, some important agricultural activities will be carried out, such as pruning fruit trees and maintaining greenhouses.

Animals migrate and store food.

The first frost is also an important turning point for many animals. Some temperature-sensitive migratory birds began to migrate from south to north in search of more suitable habitats and food sources. Other animals will adopt the strategy of storing food, such as squirrels collecting nuts and birds storing seeds. Get through the winter when food is scarce.

dry climate

As the temperature drops, the moisture content in the air also decreases, resulting in a drier climate after the first frost. This may bring discomfort to some people with respiratory diseases. At this time, we should pay attention to maintaining proper indoor humidity, drinking water and hydrating to keep the skin moist.

Expand knowledge:

The first frost is one of the traditional solar terms in China, which is of great significance in ancient farming society. People usually hold sacrificial activities during the first frost to thank heaven and earth and pray for a bumper harvest and peace in the coming year. At the same time, the first frost is also regarded as an important node in agricultural proverbs, and people predict the future weather trend according to the weather changes before and after the first frost.