Since which month of the year, the temperature has dropped significantly.

Generally, from the middle and late September, the temperature drops obviously and the weather gets cold.

There are 24 solar terms in a year. Ancient agriculture in China was carried out according to the 24 solar terms, and each solar term had corresponding farm work, which was also the basis.

The weather conditions determine these solar terms.

Beginning of autumn, the 13 of the 24 solar terms, is held in beginning of autumn from August 7th to 9th every year. "Autumn" means that summer is cool, that is, autumn.

Here we go. After beginning of autumn, although the summer heat is hard to disappear for a while, there is still the afterglow of "autumn tiger", but the general trend is that the weather is getting colder and colder.

White dew: The weather turns cold and the dew condenses into white. The Millennium is usually in September, and cool weather usually begins at this time.

Extended data:

The characteristics of the twenty-four solar terms:

autumn

Beginning of autumn: refers to the southwest; The solar line is 135. The beginning of autumn. Gregorian calendar 07-09 August.

Summer: fighting fingers; The solar line is 150. Place means stop and hide. Summer is the end of hot summer. August 22-24 of Gregorian calendar.

White dew: fighting finger; The solar line is 165. The weather became cold, with dew and white. Gregorian calendar 07-09 September.

Autumnal equinox: the bucket refers to itself; The solar line is 180. Divide day and night equally. Gregorian calendar September 22-24.

Cold dew: fighting nails; The solar line is 195. Dew is cold and will freeze. Gregorian calendar 18-09 10 month.

First frost: fingers; The longitude of the sun is 2 10. It's getting colder and colder, and it's frosting. Gregorian calendar 65438+1October 23-24. ? [2]?

winter

Beginning of winter: the war refers to the northwest; The meridian of the sun is 225 degrees. The beginning of winter. Gregorian calendar165438+1October 7-8.

Xiaoxue: Fighting refers to yourself; The meridian of the sun is 240 degrees. This means it's starting to snow. Gregorian calendar165438+1October 22-23.

Heavy snow: fighting fingers; The meridian of the sun is 255 degrees. As the snowfall increases, there may be snow on the ground. Gregorian calendar 65438+February 6-8.

Solstice of winter: fighting fingers; The meridian of the sun is 270 degrees. The cold winter is coming. Gregorian calendar 65438+February 2 1-23.

Slight cold: fighting fingers; The meridian of the sun is 285 degrees. The climate began to get cold. Gregorian calendar 65438+1October 5-7.

Great cold: fighting refers to ugliness; The longitude of the sun is 300 degrees. The coldest time of the year. Gregorian calendar 65438+1October 20th -2 1.

References:

Baidu encyclopedia-24 solar terms