Frost is what mean

In the mid to late October each year, the traditionalThe 24 solar termsThe frost, the autumn frost's descent is also about the last solar term, is qiu dong season alternate solar terms.On October 23, 2013 is China's traditional throttle "frost", contains the weather gets colder, the first frost of frost solar terms, is one of the last autumn solar term, also means the beginning of winter, the frost season, health care is especially important, there is a folk proverb "through a year to fill, not fill frost", it serves to show the throttle effect on us.

At this time of morning and evening temperature difference is very big, sometimes at night the temperature has reached 0 degrees Celsius, condense into ice directly on the ground or plant needle is visible, thus proves that the 24 solar terms of frost, predict the weather gradually became cold.

After the frost, plant have no vitality, this shows that the frost is ruthless, cruel.Frost, of course, most of the reflected in the north and the south at the throttle of the frost, no cream can come too.

Although said that after the frost, wind cooling, the temperature gradually cool, but still have difference of frost and frost, crops have frost that harm is great, and meet the dangers of frost crops will be much smaller.Because water vapor condensation of frost cover foliage on crops, not only harm to the crops, when melting water vapor may also release a lot of heat.

Solar terms outlined

Frost is one of the 24 solar terms, the weather gets colder, start with cream.Frost is generally in the Gregorian calendar every year on October 23, [2].When China's first frost, the Yellow River basin area much more busy planting crops of the high.

Chinese ancient frost can be divided into three hou, "a jackal Hudson is the beast;Two yellow fall hou vegetation;Three hou sting salted down."The Wolf will capture prey to display in the throttle before eating.

After the Gregorian calendar every year on October 23, the sun arrived at longitude 210 degrees of frost.Frost says it's more cold dew condensation

Frost and crops

Forming cream.Departure pulled seventy-two hou the: "in the September, gas against and condensation, frost dew knot".At this point, the Yellow River basin in China there has been a white frost, li lies on a piece of ice crystals shining silver, at this point the leaves yellow, in the leaves.Ancient books "the twenty-four solar terms solution," said: "gas against the frost, Yin coagulation also."Visible "frost" said the weather gradually cool, began to drop the frost.Meteorology, generally called the first appeared in the fall of the frost "early frost" or "first frost", but the last time the spring in the cream called "smear" or "last frost.From the last frost to the first frost interval period, is the frost-free period.Have called the early frost frost "chrysanthemum", since the chrysanthemum in full bloom, northern song dynasty writer Su Shiyou poems said: "thousands of trees and one yellow, only alone aromatic lotus".

Frost is moisture condensed, how condensed moisture cream?The southern song dynasty poet Lv Benzhong in a southern song · brigade, wrote: "yi in oblique, degree of late frost creek bridge."Lu you write in the frost monthly "hay frosted white, is cold month."Show clear moonlit frost in autumn.Autumn night no clouds, the ground like jie, to the heat, the temperature fell to below 0 ℃, abruptly on the ground is not much water vapor will condense on the crook, bridge, leaves, and dirt, forming small ice needle, some become hexagonal the frost.Frost, can only be formed in the sunny days, people say "thick cream fierce sun" is this truth.

The climate characteristics

Because the frozen have cream (sometimes no frost says black cream), so the autumn frost and spring frost generally referred to as the frost.

Frost throttle contains the weather gets colder, start frosty.Latitude by south of the south, the average temperature around 16 ℃, from the date of first frost and three solar terms.River valley in the south of southern China, to the depths of winter season, can see the frost.Of course, even in the same latitude, due to the different altitude and terrain, there are differences between the formation of air temperature and humidity, the early frost season and frost days also is different.The frost season, cool autumn wind has blown to guangzhou huacheng.Most of northeast in northern, eastern Inner Mongolia and northwest the average temperature is below 0 ℃.

"Frost frost" reflects the climate characteristics of the Yellow River basin.In terms of frost days throughout the year, some places even in summer on the qinghai-tibet plateau have frost and snow, the frost, are more than 200 days, is where the cream day in our country.South qilian mountain, eastern Tibet, qinghai, he ethnoniedicinal, northwest yunnan, tianshan mountain, al tai shan district, the western mountains of northern xinjiang, northeast and eastern Inner Mongolia and other places in frost days are more than 100 days.