How many degrees below zero can it snow?

Below 3.0℃ (freezing point). If the cold air is quite strong and carries moisture, it can snow at the temperature of 1℃ to 10℃.

Formation of snow

Water vapor in the atmosphere condenses directly or water droplets condense directly, which is snow. It can also be said that it snows when the temperature in the cloud is too low and small water droplets form ice crystals and fall to the ground or snow. Ice absorbs heat when it melts, so the ground temperature will be lower than when it snows.

1, the atmosphere needs to contain cold ice crystal nuclei.

2. Sufficient water vapor. Below 3.0℃ (freezing point). If the cold air is quite strong and carries moisture, it can snow at the temperature of 1℃ to 10℃.

Where it can snow: The climate zone belongs to the middle latitude to the high latitude (that is, the area south of the Tropic of Cancer/north of the Tropic of Cancer), and some Zhongshan or plateau with an altitude of more than 2000 meters in the low latitude area will also have the same opportunity.

Extended data

The efficacy and function of snow

1, eliminating fungi and bacteria

Eliminating fungi and bacteria in the air is an important function of blood. When it snows, the weather is very cold and the temperature will be relatively low, which can kill bacteria and fungi in the air and reduce their harm to human body. If it snows more than a few times every winter, it can effectively prevent the spread of epidemic diseases. Purifying the air is also an important role of snow. It can remove pollutants from the atmosphere. Every time it snows, people will feel that the air is particularly fresh and breathing will be particularly comfortable.

2. Prevent and alleviate frostbite

Snow can also prevent human skin from frostbite. After it snows every year, you can take a proper amount of snow and rub it back and forth in your hands to speed up the blood circulation on the skin surface and enhance the cold resistance of the skin, which can effectively prevent frostbite.

3. Enhance physical fitness and prolong life.

People collect snow and turn it into bath water. These natural snow waters can nourish the skin, improve the body's disease resistance, accelerate the blood circulation in the human body, and obviously improve the quality of the human body. If you can drink these pure snow water for a long time, you can prolong your life. It is said that this is the secret of longevity of many people in plateau snow areas.

4. Promote the growth of crops

Snow is not only beneficial to human health, but also conducive to maintaining the balance of the ecological environment and promoting the growth of crops. It has a certain heat preservation effect, which can prevent crops from frostbite after snowing in winter every year, and can provide sufficient water for plants after the snow melts in spring, so that crops can grow rapidly and healthily. In addition, snow can improve soil fertility, and the soil itself is rich in nitrogen, which is a necessary fertilizer for crop growth.

References:

Baidu encyclopedia-snow