Why is it not cold when it snows?

Firstly, it is pointed out that the reasons are exothermic and endothermic. It is indeed exothermic and endothermic, but of course it does not mean that the snow is not cold. As far as temperature is concerned, the temperature of snow is definitely lower than that of snow. As for why people think it is hotter when it snows, it is because the sky is cloudy and the air is not clear when it snows. When it snows, the airflow is usually windy, so it will be cold.

Why doesn't the snow melt

According to experts from the Provincial Meteorological Observatory, it is a natural phenomenon that snowfall does not cool down. As the middle school physics teacher said: "When it snows, water vapor condenses into snowflakes, so we need to release some heat, which makes it not very cold before or when it snows;" But when it snows, water changes from solid to liquid, absorbs heat from the air and lowers the temperature. "That makes sense. But from the meteorological point of view, the formation of this natural phenomenon, on the other hand, is affected by the cold and warm air flow before and after snowfall.

According to reports, it is not cold when it snows, mainly because the warm and humid airflow is active before or when it snows in winter, accompanied by high-altitude southwest winds. The weather is getting warmer and warmer, and the cold and warm air meet. Warm air rises along the strong cold air, and water vapor condenses directly into small ice crystals of stars, flakes or columns. When the ice crystals grow up slowly and the air can't hold them, they will fall to the ground and form snow. The snow cleared up the day after tomorrow Generally speaking, cold air goes south and high altitude goes north. The ground is controlled by the quality of air conditioning, and the temperature will naturally drop.

Therefore, when the snow melts, the weather is colder than when it snows.

When is the coldest time of the year?

65438+1October 20th or 2 1 means "cold", which means the coldest time of the year. However, except in South China, the coldest period is in the middle of 1 month. The cold solar terms mainly appeared on April 9 and May 9, and the temperature began to rise slowly. However, cold and dry weather is a feature of severe cold.

The three solar terms "Winter Solstice", "Slight Cold" and "Great Cold" are called "Midwinter" by China people. In the dead of winter, there are about 5 days of cold air going south on average. Cold wave, frost and blizzard are the main disastrous weather in the middle of winter. In June 5438, the lowest temperature was below 0℃ for 20 days and it snowed for 3 days.