Frost drops the solar terms
12:51 on October 23, 2021
Frostfall is the sixth solar term of autumn
It is also the last solar term of autumn
It begins around October 23 of the Gregorian calendar every year
It is said in the "Seventy-two Waiting Solutions to the Moon Order"
"The breath is condensed and condensed, and the dew is frosted"
With the arrival of the "frost fall"
Crops, grasses and trees begin to turn yellow and fall leaves
It has entered the late autumn of "a thousand trees sweeping into yellow"
Winter footsteps are creeping closer
Frost Falls Three Seasons: One waits for the jackal to be sacrificed to the beast
The second season of grass and trees fall yellow; the third wait for stings is salty
Although called frost fall
But frost does not fall from the sky
Instead, the water vapor in the air near the ground is on the ground
Or white loose ice crystals directly condensed on the ground
This is because on a clear and cloudless night
Ground heat dissipates quickly
In the first half of the night, the ground stores more heat during the day
The temperature is generally not easy to drop below 0 °C
It was in the middle of the night and before dawn
The remaining heat on the ground is gone
And very little heat is compensated for atmospheric radiation
When the temperature drops below 0 °C
Water vapor in the air near the ground is attached to the dirt blocks
On stones, leaves, grass, tiles, etc
It condenses into ice crystals, thus forming frost
The first frost is called "early frost"
The last frost that appears in spring is called "late frost"
The period from early frost to late frost is called the "frost period"
The period between "morning and evening frost" is called the frost period
The rest of the time is called a frost-free period
The number of frost-free periods is a measure of the climate in various places
An important data indicator
China is a vast country, and the frost period varies greatly from place to place
In summer, there are also frosts in some areas on the Tibetan Plateau
The annual frost day is more than 200 days, which is the place with the most frost days in China
Most of the rest of the north took more than 100 days
The Huai River, south of the Han River, and east of the eastern slope of the Qinghai-Tibet Plateau
The vast area is under 50 days
South of 25 degrees north latitude and the Sichuan Basin there are only about 10 days
Further south, the average annual frost day along the coast of Liangguang is less than 1 day
Xishuangbanna, Hainan and southern Taiwan
and the South China Sea Islands have no frost throughout the year
Picture from China National Geographic, Issue 01, 2008
Heaven and earth are naturally beautiful for a while
Be proud and wither with the times
Autumn approaches winter at the end of ripening
The hidden nature of winter is the beginning of spring again
In this way, nature nurtures each other and lives endlessly
Grab the tail of autumn
Enjoy the beauty of autumn again
Then keep fueling and enrich yourself
Pack up and go
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Ulanbutong, Inner Mongolia
Beijing
Ganzi, Sichuan
Qingdao, Shandong
Kunming, Yunnan
Nanjing, Jiangsu
Shannan, Tibet
topic
Late autumn is approaching, are you ready for winter?
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Picture from: Visual China, Figureworm
Edit / Kun Kun
Design / Majestic