Climatic characteristics of autumnal equinox

Climatic characteristics of autumnal equinox: the temperature gradually decreases, the weather gets cooler and the rainfall decreases. The climatic characteristics of the autumnal equinox are described in chapters according to serial numbers.

1. Temperature gradually decreases:

With the arrival of the autumnal equinox, the summer heat gradually subsided and the weather began to turn cold. During the day, the temperature drops gradually, and the temperature difference between morning and evening increases obviously. After the autumnal equinox, the temperature will continue to drop, warm and comfortable during the day and a little cold at night.

2. The weather is getting cooler and cooler;

After the autumnal equinox, the weather in most areas began to cool down. As the direct point of the sun moves to the south of the equator, the oblique angle of the sun becomes smaller and the irradiation area becomes larger, which reduces the solar radiation energy and leads to the temperature drop. At the same time, due to the change of water vapor content in the air, the humidity is relatively low, and people will feel crisp and dry weather in autumn.

3. Decreased rainfall:

At the autumnal equinox, rainfall in most areas began to decrease. When autumn comes, the monsoon climate gradually ends, the warm and humid airflow weakens, and the rainfall opportunities become less. Compared with rainy summer, the climate after the autumnal equinox is drier, the rainfall is obviously reduced, and the days in Wan Li with clear skies are increasing.

4. The wind is gradually increasing:

After the autumnal equinox, the wind gradually increases in areas with large temperature changes. Due to the pressure change caused by temperature difference and the influence of cold air going south, the wind will gradually increase. People will feel the autumn wind blowing gently, especially in the morning and evening when the wind is strong, so they may need to pay attention to wind protection and warmth.

5. The sunshine time is reduced:

After the autumnal equinox, the daylight hours gradually decrease. Due to the inclination of the earth's rotation axis, the solar altitude angle decreases, which makes the direct point of the sun move south and shortens the sunshine time accordingly. This is also an important factor in the cooler weather after the autumnal equinox.

Summary:

The climatic characteristics of the autumnal equinox include the gradual decrease of temperature, the cold weather, the decrease of rainfall, the increase of wind force and the decrease of sunshine time. These characteristics are the signs of the arrival of autumn, and also bring people a cool and pleasant autumn atmosphere.