Climate characteristics of the autumnal equinox
The climate characteristics of the Autumn Equinox: the temperature drops, the temperature difference between day and night increases, the climate is pleasant, the temperature gradually drops, and the rainfall is less.
1. Temperature drops
my country's Yangtze River Basin and the vast areas north of it have entered autumn during the autumnal equinox, and the daily average temperature has dropped below 22°C.
2. The temperature difference between day and night increases
After the autumnal equinox, the direct sunlight position moves southward, the days in the northern hemisphere are shorter and the nights are longer, the temperature difference between day and night increases, and the temperature drops day by day.
3. Pleasant climate
The cold air mass in the north has begun to have a certain influence. The rainy season has just ended in most areas. There is a cool breeze, blue sky, beautiful wind and sunny weather, crisp autumn air, and sweet osmanthus floating in the air. Fragrant, crabs are fat and chrysanthemums are yellow, it is a beautiful and pleasant season.
4. The temperature gradually drops
The temperature difference between day and night increases significantly. Although the sun is still relatively bright during the day, the temperature is relatively low, generally around 20 degrees Celsius. At night, the temperature will drop sharply and chills often occur. At this time, people will feel cool
5. Less rainfall
During the autumnal equinox, there is less rainfall and it is relatively dry. Still, there is a chance of some showers or light rain for a while after the equinox, but overall there won't be much rainfall during the equinox.
The meaning of the autumnal equinox
The autumnal equinox is one of the twenty-four solar terms, usually on September 22 or 23 every year. It has two meanings:
1. First, "fen" here means "half" or "half".
The autumnal equinox means that on this day, the sun almost shines directly on the earth's equator, and day and night are of equal length in all parts of the world, with each being 12 hours long. This is the midpoint of the ninety days of autumn, hence the name "Autumnal Equinox". Secondly, after the autumnal equinox, the direct sunlight position moves southward, the days in the northern hemisphere are shorter and the nights are longer, the temperature difference between day and night increases, and the temperature drops day by day.
2. In ancient my country, the autumnal equinox was divided into three seasons.
"At the first moment, the thunder begins to cease; at the second moment, the stinging insects disappear; at the third moment, the water begins to dry up." The ancients believed that thunder was caused by strong yang energy. After the autumnal equinox, yin energy began to become strong, so thunder no longer occurred. The word "璋" in the second horoscope means fine soil, which means that as the weather gets colder, hibernating insects begin to hide in caves, and the entrances of the caves are sealed with fine soil to prevent the cold air from intruding.
The third period is when the rainfall begins to decrease. Due to the dry weather, water vapor evaporates quickly, so the amount of water in lakes and rivers becomes less, and some swamps and puddles are drying up. .