Is the coldest time of the day in winter late at night or early in the morning? 5

The coldest part of winter is the early hours of the day.

It is correct to say that before the sun comes out, because the ground is an exothermic process when there is no sunlight, from sunset to sunrise is exothermic, and the heat of the ground reaches its lowest point before sunrise, and the ground begins to absorb heat as soon as the sun comes out, and the temperature begins to rise. Of course, this is true when there is a sun, but it is the same even when there is no sun.

According to the principle of atmospheric radiation and inverse radiation, the earth absorbs heat in the morning during the day, and when it reaches about 14 o'clock in the afternoon, the ground absorbs heat almost saturated, and the temperature will reach the highest. At this time, the sun begins to set, the saturated ground will start to heat off appropriately, the ground temperature begins to decrease, there is no sunlight at night to bring heat, the temperature at high altitude will drop sharply, and the ground at the same time to form a thermal difference, so that the ground will continue to be in the heat release state (reverse radiation), until the sun appears in the morning when it begins to absorb heat, if there is no sun the next day, the temperature is higher than the night under the influence of various factors during the day (the integrity of the earth's temperature), so, The coldest part of the day is a short time around sunrise in the morning, around five o'clock!

The coldest time is early in the morning, around sunrise to be exact, and the early morning is colder than the late night anyway.

Summary. Second, because the ground will absorb solar radiation and become warmer, and there is no sun at night, so it is cold in the morning. And the sun slowly gets hotter after a while.

Morning. Why is it cold in the morning, hot at noon, and cold at night.

1. Because the solar irradiation angle is small in the morning, the amount of solar radiation is small, so it is cold.

Second, because the ground will absorb solar radiation and become warmer, and there is no sun at night, so it is cold in the morning. And the sun slowly gets hotter after a while.

3. The water vapor in the air at night forms water droplets, which should evaporate in the morning to absorb the heat in the surrounding air. So it's cold in the morning.

Feel-wise.

It feels colder in the morning, because the human body has been accustomed to the temperature in the quilt after a night's sleep, and going out again is equivalent to experiencing a double temperature loss for the first time in the middle of the day, and it will feel particularly cold at this time, of course, if you compare the morning with the late night, the late night is colder.

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The coldest time of the day is around sunrise in the morning. The highest temperature on the mainland generally occurs around 2 p.m., and the lowest temperature is generally before sunrise. After noon, although the solar radiation begins to weaken, the heat of solar radiation obtained by the ground is still more than the heat lost by ground radiation, and the heat stored on the ground continues to increase until the heat of solar radiation begins to be less than the heat of burning lost by ground radiation, that is, the moment when the surplus turns into a loss, and the ground temperature reaches the highest value.

After sunset, there is no solar radiation, the ground loses heat**, but it is still releasing heat, and the atmosphere can only play a certain role in heat preservation, and part of the heat emitted by the ground is returned to the ground through the application**Bison, but it will still lose part of the heat.

Throughout the night, the ground was just releasing heat, not supplementing it. As the temperature decreases, so does the temperature of the near-surface atmosphere, until sunrise when the ground and near-surface atmosphere begin to replenish heat again.

In China, it should be the three days around the Great Cold in the 24 solar terms, which should be the coldest days of the year according to the Chinese lunar calendar, but with global warming, the influence of geographical factors seems to be less accurate.

Related information: January 20 or 21 is the "Great Cold", and the original meaning of the Great Cold solar term is the coldest time of the year. However, except for South China, the coldest period in other places in China is in "March 9", that is, in mid-January. The big cold solar term is mainly in the "four nine" and "five slag sail nine", and the temperature has begun to rise slowly.

Despite this, cold and dry weather is characteristic of the Great Cold.

The folk of our country call the three solar terms of "Winter Solstice", "Little Cold" and "Big Cold" as "Midwinter Qiliang Smile". In the middle of winter, there is an average of about once in 5 days or so cold air south, and cold waves, frosts, and heavy snowfall are the main disastrous weather in midwinter. There are 20 days with low temperatures below 0 and 3 snowy days in January.

The Great Cold is the last of the "24 solar terms", and the "Spring Festival" in many years is in the Great Cold solar term. As long as people do not violate the agricultural season and arrange their production and life according to the characteristics of the weather, they will be able to pursue advantages and avoid disadvantages, improve the economic returns of industrial and agricultural production, and enhance the people's physical fitness, so that they can happily spend the Spring Festival.