Why is the temperature difference greater on a sunny day in winter than on a rainy day

Because on a sunny day in winter, the earth's surface receives solar energy quickly during the day, and the temperature rises sharply, but at night, because it is a sunny day, there are fewer clouds in the sky, and the temperature on the earth radiates to the sky outside the earth, causing a large outflow of temperature, so the temperature difference is large, and on a rainy day, the sky is overcast, and it is difficult for the temperature on the earth's surface to lose, so there is no change throughout the day.

There is a point to understand: the weather is generally sunny when the warm air from the south is dominant, and it is also sunny when the cold air from the north is dominant, and it is generally cloudy, rainy and snowy in the area where the warm and cold air flow intersects. Warm and cold air currents are generally always pushed around, as the saying goes:

Either the south wind overpowers the north wind or the northwest wind overpowers the southeast wind, and at their intersection there is always rain or snow or cloudy, called warm and moist air flow. In winter, the cold air in the north is dominant, and sunny days are often cold, when there is a warm air from the south to the north, the warm air flow has a large water content, the hot and cold are transferred, and the air is condensed, which is often rainy weather, or frozen into snowflakes, so it will not be too cold on rainy days in winter, but cold on sunny days, and it is colder on sunny days after snow, because there is also a truth that "snow is heat release, snow is heat absorption" and summer is just the opposite!

The thermal insulation of the atmosphere, rainy days, thick clouds, little change in temperature during the day and night; On a sunny day, there are no clouds, and the temperature rises quickly during the day and cools down quickly at night, resulting in a large temperature difference. In fact, summer is the same, not because of the season.

On rainy days, it doesn't change much, and on sunny days, the sun warms up a little bit and increases the temperature difference.

Because of the low temperature in winter, the temperature on the ground is below freezing, and the temperature in the clouds above the sky is even lower. The water vapor in the clouds directly condenses into Xiaoice crystals and small snowflakes, and when these snowflakes increase to a certain extent, the air flow can no longer support it, and it falls from the clouds to the ground, which is snow.

Winter temperatures are low, especially at the surface of the earth, where temperatures are below freezing, and the temperatures of clouds at high altitude are even lower. The water vapor in the cloud can directly condense into small snowflakes and Xiaoice crystals, and when it increases to the point that the air flow cannot support it, it will fall from the clouds to the ground and snow.

This is a climatic phenomenon, because when cold and warm air meet, rain is formed, and in winter, due to the strength of cold air and low surface temperature, snowflakes are formed before the rain has landed, so you see that it is snowing on a sunny day

Why is it that when it snows in winter, people don't feel cold, but when the snow melts, they feel much more cynical? In winter, cold air moves from north to south in waves, and when it meets the warm, moist air from the south, it becomes cloudy and produces snowfall. Before the snowfall, the cold air is weaker (and therefore less windy) and warms up after staying there for a longer period of time, and the air flow from the south brings the warmer air to the north.

When the cold air strengthens, the warm and moist air is lifted up into clouds, and the sky is covered with clouds, as if covered with a quilt, and the heat on the ground is not easy to lose. So, people don't feel as cold before and when it snows in winter. When the cold air continues to strengthen during the snowfall, so that the strong cold air takes control of the area, the snow will stop and the weather will become clearer.

At this time, because the cold air is controlled from the ground to the hollow, and the north wind or northwest wind blows more, the wind is stronger, the cloud dissipates and loses the effect of heat preservation, the reflection effect of the snow surface is larger, and when the snow melts under the sun, it has to absorb a lot of heat from the air layer near the ground and reduce the air temperature. As a result, people feel that it is much colder when the snow melts than when it snows.

Nature! Sometimes it's a mystery. It's snowing on a sunny day, maybe there are frozen clotts in some places! You have to analyze it scientifically.

It is normal for snow to fall in winter, whether it is sunny or cloudy, it is due to the low temperature, which makes the water in the air condense into ice crystals, and when the weight exceeds a certain amount, it will fall from the sky and form snow!!

Snow is a natural phenomenon, the atmospheric temperature drops below zero, and the water vapor in the clouds solidifies into Xiaoice crystals, which fall due to their own weight, forming snow.

The temperature of the snow is just right, and the older generation will say that the snow is open.

Snow "first light snow has a large area, first a large area and then a sunny day", this sentence is a law of snowfall, if it starts to snow lightly, it is likely to be followed by heavy snow; If there is a lot of snow first, it will be sunny later.

Caused by low temperature and high humidity.

Winter is not winter if it doesn't snow.

Winter temperatures are quite low, and the ground temperature is also below freezing, so the temperature of the clouds in the upper sky is even lower. The water vapor in the clouds can directly condense into Xiaoice crystals and small snowflakes, and when these snowflakes increase to a considerable extent, the air flow will not be able to support it, and it will fall from the clouds to the ground, which is snow. Because there is a fairly strong updraft, the temperature of the air is very high, and the snowflakes grow in the clouds for a long time, so the snowflakes that fall are very large.

At the same time, due to the large area of snowflakes and the large resistance they are subjected to, they will not fall to the ground quickly when they flutter in the air, so they collide, stick and gather more and more with other snowflakes in the air, and when they are close to the ground, they are blowing heavy snow.

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It is sunny day and night, and the temperature difference will be large. The reason is the atmospheric radiation to the sun during the day.

Less weakening, strong solar radiation reaching the ground, high temperature; The night is clear, the atmospheric inverse radiation weakens, and the heat to the ground is less, and the temperature is low.

It's cloudy day and night.

The temperature difference will be smaller. The reason is that the atmosphere is weakened by solar radiation during the day, and the solar radiation reaching the ground is weak, and the temperature is lower than that in clear days. The night is cloudy, and the increased atmospheric inverse radiation also gives more heat to the ground, and the temperature is higher than that of a clear night.

There is a large temperature difference on a sunny day, because the clouds can reduce the loss of heat from the ground at night! On a sunny day, there are no clouds at night, and the heat is lost quickly, so the temperature difference increases, and on a cloudy day, the opposite is true!

Day and night are sunny days and the temperature difference will be larger, the reason is that the atmosphere is less weakened by solar radiation during the day, the solar radiation reaching the ground is strong, the temperature is high, and the negative radiation of the clear atmosphere at night is weakened and the heat to the ground is less, and the temperature is low.

The temperature difference between day and night is cloudy, because the atmosphere weakens the solar radiation during the day, the solar radiation reaching the ground is weak, and the temperature is lower than that of the clear day, and the increase of atmospheric inverse radiation at night is more heat to the ground, and the temperature is higher than that of the clear night.

During the day, under the sun's rays, the earth's surface absorbs a lot of heat. If it's a sunny day, a lot of heat will be lost at night, and the temperature will drop a lot; If it is a cloudy day, because of the obscuration of clouds at night, it is like covering the earth with a quilt, which will retain a certain amount of heat and shake hands, and the temperature will drop less. Therefore, the temperature difference is large on sunny days, and smaller on cloudy days.

On rainy days, the air contains a lot of water vapor. It is a causal cave that affects atmospheric pressure. Atmospheric pressure is produced by the movement of air molecules. So the air containing water vapor has less atmospheric pressure.

In winter, the temperature is low and the density of the air is comparatively larger. The air pressure is related to the degree of dense lithology, and the density is greater than the pressure. Therefore, the air pressure in winter is higher than in summer.

Of course, there are many factors that affect atmospheric pressure, and these are just one aspect. For example: air currents, humidity, seasons, typhoons, weather, etc.

It should be said that because the atmosphere is located in an open space around the earth, and there is no specific boundary that restricts its range of motion, this makes it different from the gas in a closed container For a closed container containing air, as long as the gas in the container does not reach saturation, then when we input a draft gauge into the container, the pressure of the gas will inevitably increase, while the atmosphere is not the case When the atmospheric humidity in a certain area increases due to natural or man-made factors, the "moist air" in that area"Molecules (including air molecules and water vapor molecules) will inevitably diffuse into the surrounding area, and the result will be that the amount of 'dry air' in the atmosphere of the region will be smaller than that of the surrounding area, and the water vapor content will be greater than that of the surrounding area, just as the density of the mixture in soybeans is less than that of soybeans, so the density of moist air in this area is less than that of dry air in other areas. The amount of heavy burial is also smaller than that of the same air column in other dry air areas, which also tells us that the atmospheric pressure decreases with the increase of air humidity In terms of cloudy days and sunny days, in fact, the air humidity on cloudy days is greater than that on sunny days, so the atmospheric pressure on cloudy days is smaller than that on sunny days Because the total amount of atmosphere on Earth is basically constant When the temperature in one area increases, it is often accompanied by a decrease in the temperature of another area, which brings the possibility of air diffusion from high temperatures to low temperatures And the result of diffusion is often that the air pressure at high temperatures is lower than that at low temperatures, when the northern hemisphere is the summer that receives the most solar heat, the southern hemisphere is the harsh winter that receives the least solar heat, at this time, because the air in the northern hemisphere is going to spread to the southern hemisphere, the air pressure in the northern hemisphere is lower than that in the southern hemisphere, and because the total amount of the atmosphere is basically unchanged, the air pressure in the northern hemisphere is lower than the standard atmospheric pressure, and the air pressure in the southern hemisphere will of course be higher than the standard atmospheric pressure Similarly, The diffusion of air in the opposite direction will cause the air pressure in the Northern Hemisphere to be higher than the standard atmospheric pressure in the winter As a result, the atmospheric pressure in the Northern Hemisphere will be lower in winter than in summer

The gradual drop in temperature after the beginning of winter has nothing to do with the weather.

Because the heat stored on the surface still has a certain amount of energy, it is generally not very cold in early winter; As time goes on, the strong cold air moves southward more frequently and crosses the South Ridge, and the weather becomes colder and colder. In the north, it was already cold before the beginning of winter.

The tradition is to "start winter" as the beginning of winter, "spring, summer, autumn, winter storage", winter is the season to enjoy the harvest, rest and recuperate, the beginning of winter in ancient folk is one of the "four seasons and eight festivals", in ancient China, some places will hold sacrifices, feasts and other activities in the beginning of winter, as an important festival to celebrate.