Is the autumnal equinox still hot? How to pay attention to the temperature difference between morning and evening in autumn equinox solar terms?

The weather in autumn seems to be playing hide-and-seek with everyone. It's always hot at noon, but it's cold in the morning and evening. This temperature difference really makes people laugh and cry. I don't know whether to wear thin or thick. So is it cold or hot after the autumnal equinox? Let's get to know each other.

The autumnal equinox is the sixteenth solar term in the twenty-four solar terms of the lunar calendar, usually on September 23rd or 24th every year. On this day, the sun reached longitude 180 degrees and hit the equator of the earth directly. So a day is divided into 24 hours, and each hour has 12 hours. There is no extreme day and night phenomenon in the world. After the autumnal equinox, the direct point of the sun continues to move southward, so the autumnal equinox is also called declination.

According to the standard of climatology, in the "autumnal equinox" season, the average daily temperature in the Yangtze River basin and its northern area drops below 22℃, which is phenological autumn. At this time, the cold air mass from the north has had a certain impact. The rainy season has ended in most parts of the country, and words such as breezy breeze, cloudless blue sky in Wan Li, sunny weather, crisp autumn air, sweet osmanthus fragrance and yellow crab and fat chrysanthemum are all descriptions of this scene.

After the autumnal equinox, the direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but the ground lost more heat and the temperature dropped significantly. The agricultural proverb says, "an autumn rain and a cold". "In August, the wild goose gate opens, and the foot of the wild goose is frosty." It is not surprising that the temperature in Northeast China drops early and frost appears at the autumnal equinox.

According to meteorologists, according to the lunar calendar, "beginning of autumn" is the beginning of autumn, and "first frost" is the end of autumn. The "vernal equinox" is exactly half of the 90 days from beginning of autumn to the first frost. From the day of the autumnal equinox, the climate has three main characteristics: the position of direct sunlight continues to move from the equator to the southern hemisphere, and the phenomenon of short days and long nights in the northern hemisphere will become more and more obvious. The days will gradually shorten and the nights will gradually lengthen (until the winter solstice reaches the longest night and the shortest day); The temperature difference between day and night will gradually increase, and the amplitude will be higher than 10℃. The temperature drops day by day, getting colder every day, and gradually entering the late autumn season. The situation in the southern hemisphere is just the opposite.

It becomes cold after the first frost, which is the last solar term in autumn. "First frost" means that the weather gets cold and frost begins, usually on the 23rd day of Gregorian calendar 10 every year.

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