Climate characteristics of the autumnal equinox
The climate characteristics of the autumnal equinox are: the temperature gradually decreases, the weather becomes cooler, and the rainfall decreases. The following describes the climate characteristics of the autumnal equinox in sections according to serial numbers and titles.
1. The temperature gradually decreases:
With the arrival of the autumnal equinox, the heat of summer gradually subsides and the weather begins to get cooler. The temperature gradually drops during the day, and the temperature difference between morning and evening increases significantly. After the autumnal equinox and entering the official stage of autumn, the temperature will continue to drop, with warm and comfortable days and some cool nights.
2. The weather gets cooler:
After the autumnal equinox, the weather starts to get cooler in most areas. As the direct point of the sun moves south of the equator, the angle of oblique sunlight becomes smaller and the illuminated area becomes larger, which reduces the solar radiation energy and causes the temperature to drop. At the same time, due to changes in water vapor content in the air, the humidity is relatively low, and people will feel refreshing and dry autumn weather.
3. Rainfall decreases:
During the autumnal equinox, rainfall begins to decrease in most areas. As autumn enters, the monsoon climate gradually ends and the warm and humid air flow weakens, resulting in less chance of rainfall. Compared with the rainy summer, the climate is drier after the autumnal equinox, with significantly less rainfall and more days with clear skies.
4. The wind force gradually increases:
After the autumnal equinox, the wind force gradually increases in areas with large temperature changes. Due to changes in air pressure caused by temperature differences and the southward influence of cold air, the wind will gradually increase. People will feel the autumn breeze, especially in the morning and evening when the wind is strong, and they may need to pay attention to wind protection and warmth.
5. Reduction of sunshine hours:
After the autumnal equinox, the sunshine hours during the day gradually decrease. Due to the tilt of the earth's rotation axis, the sun's altitude angle decreases, causing the sun's direct point to move southward and shortening the daylight hours accordingly. This is also an important factor in the cooler weather after the autumnal equinox.
Summary:
The climate characteristics of the autumnal equinox include gradually lowering temperatures, cooler weather, reduced rainfall, gradually increasing winds and reduced sunshine hours. These characteristics are a sign of the arrival of autumn and also bring people a cool and pleasant autumn atmosphere.