Why does the temperature get lower in autumn and is it autumn? When does it start to get cold?

From the spring equinox through the summer solstice to the autumn equinox, the northern hemisphere is in the summer half and the southern hemisphere is in the winter half. During this period, the days are longer and the nights are shorter in the Northern Hemisphere, and the days are shorter and the nights are longer in the Southern Hemisphere; The North Pole is in the polar day, and the South Pole is in the polar night; The height of the Sun north of the Tropic of Cancer is always greater than the mean and south of the Tropic of Cancer is less than the average. North of the Tropic of Capricorn, the sun rises over the horizon circle in the northeast and sets on the horizon circle in the northwest.

On the equinox, the sun rises due east and sets due west all over the world. From the autumnal equinox through the winter solstice to the spring equinox, the northern hemisphere is in the winter half of the year, and the southern hemisphere is in the summer half. During this period, the length of day and night, polar day and night, and solar altitude in the northern and southern hemispheres were reversed.

North of the Tropic of Capricorn, the sun rises over the horizon circle in the southeast and sets on the horizon circle in the southwest. From the summer solstice through the autumn equinox to the winter solstice, the northern hemisphere changes from summer to winter, and the southern hemisphere changes from winter to summer. During this period, the days in the Northern Hemisphere became shorter, the nights became longer, and the polar diurnal zone gradually shrank. In the Southern Hemisphere, the days are getting longer, the nights are getting shorter, and the polar night zone is shrinking.

The height of the Sun decreases north of the Tropic of Cancer and increases south of the Tropic of Capricorn. North of the Tropic of Capricorn, the rising direction of the sun changes from northeast to southeast, and the direction of falling changes from northwest to southwest. The autumnal equinox rises due east and sets due west.

From the winter solstice through the spring equinox to the summer solstice, the northern hemisphere changes from winter to summer, and the southern hemisphere changes from summer to winter. The variations in the length of day and night, polar day and night, and solar altitude in the northern and southern hemispheres are reversed. North of the Tropic of Capricorn, the direction of the sun rises from southeast to northeast, and the direction of setting changes from southwest to northwest.

From the winter solstice to the vernal equinox and from the summer solstice to the autumnal equinox, the length of the day is approaching the average (12 hours) around the world, and the range of polar day and night is gradually decreasing. The height of the Sun north of the Tropic of Cancer and south of the Tropic of Cancer is approaching the mean. North of the Tropic of Capricorn, the sun rises in a direction that gradually approaches due east and sets in a direction that is close to due west.

From the spring equinox to the summer solstice and from the autumn equinox to the winter solstice, the length of day and night is changing to extremes around the world, and the range of polar day and night is gradually expanding.

The height of the Sun north of the Tropic of Cancer and south of the Tropic of Cancer also tends to be extreme. The direction of the rising and setting of the sun north of the Tropic of Cancer moves northeast, southeast, northwest and southwest, respectively. Due to the complexity of the variation of the length of day and night and the height of the sun between the Tropic of Capricorn and the height of the sun, we have not fully explained it, and it is not difficult for the reader to summarize the pattern on his own.

When it comes to analysis, it's best to break it down into several stages. For example, in the Northern Hemisphere, the spring equinox to the direct sun is counted as a phase, and then to the summer solstice is the second phase, after the summer solstice to the direct sun again is the third phase, and then the winter solstice can be regarded as the next phase, and from the winter solstice to the vernal equinox is the last phase, and the sun completes a return movement. The length of day and night, the height of the sun, the direction of the sun's rise and set, and the direction of the sun at noon (e.g., the sun is north of the zenith at noon during the summer solstice in the northern hemisphere, and south of the zenith at the winter solstice), etc.

Because of the Earth's revolution, the Sun moved directly to the Southern Hemisphere.

The angle at which the sun hits the Earth becomes larger, and the amount of energy received per unit area decreases

Autumn usually starts to get colder after September.

But it depends on the region. In the north, the temperature usually drops after the beginning of autumn, and in September at the latest, but in the south, it is about to wait until November.

There is a saying that "the cool breeze arrives on the 3rd day of the beginning of autumn", but after the beginning of autumn, most areas are still dominated by sunny and cloudy weather, the rainy weather is not obvious, the temperature can still reach 31-33, the average daily temperature is still on the high side, and the weather is still "sultry".

It started to cool down and get cold around the beginning of September.

The 2021 Autumn Tiger is expected to end on August 14-22, 2021. As a result, it will not begin to cool down until the end of August. The weather in 2021 will be cooler until the end of autumn, which ends after half a month of early autumn.

From 14 to 22 August 2021, the weather will gradually cool.

1.Because after autumn, there will be a period of short-term hot weather phenomenon, called autumn tiger. It usually occurs at the turn of August and September and lasts about 7-15 days.

The beginning of autumn is on August 7, 2021, and according to the general situation, the activity time of autumn tigers is about 7-15 days. Therefore, the autumn tiger of 2021 is expected to end from August 14 to 22, 2020.

Wear long sleeves in autumn.

The weather will slowly get cooler in September, and autumn will begin on August 7th. The weather will get cooler and cooler, and it will also depend on your physical fitness. Depending on the weather conditions in the north, long-sleeved clothes will be worn in mid-October. If you're in the south, you'll probably have to wear long-sleeved clothing by mid-November.

It's up to you to be in **. In the first half of autumn, there may be waterlogging and drought. After early autumn, the autumn harvest is almost at the end of August.

There may be waterlogging, it will be cold when it rains every day, and there may be drought. The sun is also strong, but the temperature is not very high and it will be cool in the morning and evening.

Generally after September, but it depends on the region. Autumn begins to get cold is a month that mainly depends on your region, after all, each region has different times to enter autumn because of different dimensions, plus the influence of autumn tigers, so even if autumn begins, there will still be a period of short-term weather will be hot, which generally occurs at the turn of the month and lasts for about 7-15 days.

It does not cool down immediately after the beginning of autumn:The main reason why it does not cool down immediately after the beginning of autumn is because of the autumn tigers, and the autumn tigers last for a long time, so if you want to cool down completely, at least wait until September. After all, after the beginning of autumn, many places in our country have 18 days of fire, after 18 days, it begins to be cooler in the morning and evening, and the weather at that time is more comfortable than in July.

The autumn tiger after the beginning of autumn generally occurs at the turn of the month, and the duration is about 14-25 days, so no matter what year it is, it will generally be hot for about a month after the beginning of autumn.

It is not autumn yet, and the reason for the cool is that it has been raining all over the country recently. Just in time for the typhoon to strike.

It's autumn, an autumn rain and a cold.

With the arrival of the beginning of autumn, many northern parts of our country have ushered in autumn, although autumn is the harvest season, but the temperature difference between day and night is larger, and it is windy, because of this, why the temperature difference between morning and evening in autumn has become a question that many people have, and I will take a look with you below.

With the arrival of autumn, there must be a large temperature difference between day and night in many places, and the reason why the temperature difference between day and night in autumn is large is mainly related to the frequent cold air activities and radiative cooling in autumn. In autumn, the northerly wind gradually strengthens, and the activity of cold air is more frequent. At the same time, there are fewer clouds in autumn, and the flow speed of cold air in the section is faster, and the temperature drops faster.

The difference between day and night temperature difference in autumn is mainly based on your area, such as the highest temperature in Baoji is 31, and the lowest temperature is 16. Like this, you can wear a light jacket when you go out in the morning, and then take it off when you go to work or when it's hot; And be sure to wear socks and pay attention to the warmth of your feet; In addition, the current weather should be warmed with hot water, and no longer drink cold water and eat cold drinks, which is very unfavorable for people with cold bodies.

In autumn, the temperature gradually drops and the weather gradually cools down. The cold and dry cool air drives away the warm and humid heat, the moisture in the air is reduced, the sky is clear during the day, the sky is full of stars at night, and the autumn air is crisp, which makes people feel very comfortable. When the weather gets cold in early autumn, there are often dewdrops on the leaves of plants on the ground in the morning.

Fog and frost grip cracks are common in the cold late autumn. Foggy and frosty days are often sunny.

After a burst of autumn rain, the weather gradually cools, and the word gradually means to change slowly, not to say that it gets cooler, so the climate is also like this, every time it cools down a little, and finally it is winter.

Discernment: Gradually, gradually.

"Gradually" has obvious phases, and is mostly used for people's planned efforts. "Learning progressively improves".

Gradually" is only used for the change of things.

Is it cold, autumn, is the harvest season, the sun is shining, the sky is clear, the mountains are full of the fragrance of fruits, don't you feel it, is it early in the morning, and only wear suspenders, hehe, autumn will be a little cool, as long as you add a long sleeve, you won't feel cold, noon is no different from summer, if you go to the mountains to play at this time, that's called a cool, soft leaves under your feet, fresh air everywhere, warm sunshine, fragrant grass blades, The red maple leaves are on fire, do you still feel cold, hehe,

It's not necessarily cold in the true sense of the word. It can be said that this is just a transition period from high to low temperature. It has just dropped from the high temperature of summer to the low temperature. So I changed my adaptation. Suddenly, I can't stand it.

Or rather, cold. But I don't want to think about the cold of winter.

In autumn, just add more clothes. Nothing was a problem

On the one hand, from the perspective of the earth, the direct point of the sun in winter (referring to the northern hemisphere) is in the southern hemisphere, that is to say, the sunlight is concentrated in the southern hemisphere, and the northern hemisphere gets less sunlight.

Second, in winter, the days are short and the nights are long, that is, the time to receive heat is short, and the heat is dissipated for a long time, the natural temperature will drop, and the sun is obliquely shining in winter, because the orbit of the earth around the sun is an approximate elliptical orbit, and the earth is the farthest from the sun in winter, which must be the coldest season, and this is also the reason for other seasons.

Astronomically speaking, June 22 is the summer solstice, when the sun shines on the Tropic of Capricorn, the sunshine time is the longest, and it is also the hottest time, after the sun gradually moves south, and the weather gradually cools down, but until the day, the sun still shines on the northern hemisphere, so this period of time is still relatively hot, but it is gradually cooler.

There is an old saying "a burst of autumn rain and a burst of coolness", which refers to this gradually cooling situation.

The recent relatively cool weather is due to the weakening of the subtropical high, El Niño and frequent airflow activity in the Pacific Ocean, but it is not typical.

After autumn, the climate is dry and the air humidity is low, and water loss is unavoidable, so it is necessary to pay special attention to replenishing water to keep it moist. Due to the large temperature difference in autumn, the hot and cold weather makes the resistance decrease and susceptible to bacterial infection, therefore, timely replenishment of sufficient water and prevention of excessive water loss in autumn skin care is the most basic and primary skin care measure for women's beauty.

Method steps.

1. Replenish water. After the arrival of autumn, due to the fact that the air begins to become very dry, coupled with the large temperature difference between morning and evening, the weather gradually becomes colder, causing the pore to shrink, and the secretion of sebaceous glands and sweat glands on the surface is reduced, which makes it easy to lose moisture on the surface. The biggest reason for aging is the lack of water, coupled with the slow metabolism in autumn, so together with the autumn wind, many people have wrinkles or spots on their faces, acne, and the original spots and brown spots will also deepen, become dry, thicken the subcutaneous fat, tighten, and even peel and flaking.

Therefore, it is necessary to pay attention to drinking water reasonably to make up for the loss of water in summer and prevent the consumption of body fluids by autumn dryness. Drink enough water every day to allow it to penetrate into the tissues and cells to maintain the body's acid-base balance. Ensure the normal operation of the body's metabolism, and effectively discharge human waste from the body, so as to maintain the best clean and energetic.

Drinking water can be boiled water, fruit juice, mineral water and so on. Among them, plain water is the best "natural drink" and should be preferred. The green tea that Chinese like to drink has the effect of clearing heat and purging fire, and regular drinking can prevent the occurrence of certain ** diseases, such as pimples and acne.

Generally speaking, drinking 6-8 glasses of water a day can meet the needs of ** internal.

2. Balanced nutrition. Malnutrition can make a person's ** dry, coarse, wrinkled, and hard. If you consume too much animal fat, it will be oily or scaly, which is prone to acne and other diseases.

Therefore, we should pay attention to the diversity of diet and the rationality of nutrition, eat more vitamin A (animal liver, kidney, heart, lean meat, etc.) that can transform the stratum corneum and make it smooth, eat more fresh vegetables and fruits, and eat less animal foods with high saturated fatty acids. In addition, dry weather makes lips chapped, which affects both aesthetics and discomfort. To solve this problem, in addition to washing your lips with warm water and applying lip oil, you should usually eat more vitamin B?

2. Foods such as animal liver, milk, eggs, red and white radish, apples, bananas and pears.