Climatic characteristics after autumn harvest

The climatic characteristics after autumn harvest include gradually decreasing temperature, gradually drying weather, increasing wind and shortening sunshine time.

This autumn (September to165438+1October), the temperature is relatively high in most parts of the country, and the hydrothermal conditions are generally conducive to full grouting and autumn planting of autumn crops.

1. The temperature drops gradually.

After the autumn harvest, with the change of seasons, the temperature gradually drops. The heat of summer gradually fades away and is replaced by cool autumn. The temperature began to get colder during the day, but it was colder at night. This temperature drop is due to the change of solar altitude angle, which leads to the decrease of radiation energy and the decrease of heat absorbed by the surface.

The weather is getting drier and drier.

After the autumn harvest, the weather gradually became dry. When the relative humidity decreases, the precipitation decreases, and the water in the air evaporates faster. In addition, there will be a wide range of dry wind systems in autumn climate, such as westerlies and monsoons. These climatic factors make the weather dry and the air humidity low in autumn.

The wind is getting stronger and stronger.

After the autumn harvest, the wind gradually increased. This is due to the increase of air pressure difference, which leads to the generation and strengthening of wind. Changes in the atmospheric circulation system will also affect the wind force in autumn. For example, the westerly belt in the northern hemisphere will move south in autumn, and the wind will increase. These strong winds make the air flow active in autumn, giving people a refreshing and cool feeling.

Step 4 shorten the sunshine time

After the autumn harvest, the sunshine time is gradually shortened. With the arrival of autumn, the height angle of the sun decreases, and the time for the sun to directly hit the ground decreases. This leads to shorter days and longer nights. This change of sunshine time will also affect the change of temperature, making the temperature lower during the day and lower at night.

To sum up, the climate characteristics after the autumn harvest include gradually decreasing temperature, gradually drying weather, increasing wind power and shortening sunshine time. These characteristics are the result of seasonal changes and climate system, giving people a cool, dry and refreshing feeling. The climate characteristics in autumn also have a certain influence on people's agricultural production and daily life.