The first snow in the Year of the Ox came. Why does it snow after spring?

There are two conditions for snowfall: first, water vapor saturation. Another condition is that there must be condensation nuclei in the air. The size of snowflake crystals is closely related to the temperature at which water vapor condenses and crystallizes. The colder the weather, the lower the temperature and the smaller the snowflake crystal. When the weather is very cold, the diameter of snowflake crystals formed is often less than 0.05 mm.

Meteorologists have observed that when the temperature? 8℃ to? At 5℃, prismatic ice crystals are formed; What time? 5℃ to? At 3℃, acicular ice crystals are formed; What is the temperature? Thin hexagonal plate-like ice crystals are formed at 3℃ to 0℃. When the temperature is 3℃ to 0℃, the shape of snowflake is the largest and most complete. Snowflake crystals formed in very cold weather are so small that they are almost invisible to the naked eye. Only when they shine in the sun can people find them as fine powder. This kind of snow is called dry snow.

Snow is a kind of precipitation, and its forming conditions are the same as rain. The only difference is the difference in temperature at that time. Snow is formed below 0 degrees Celsius. According to meteorological observation, the near-surface temperature of snow in a place is below freezing point. If the temperature of the air near the ground was above 0 degrees Celsius, the snow falling from the air would melt. This situation is similar to hail. Generally, when the freezing height (0 degrees Celsius) is very high, the hail will melt in the process of falling and turn into water drops when it reaches the ground. However, when the hail diameter is large or the freezing height is not very high, if the temperature is below 0℃ at that time, water droplets and ice crystals will be formed when the air is saturated, or precipitation composed of white or translucent ice crystals will be formed when the temperature of water droplets falls below 0℃, which is called snow. Snow is mostly hexagonal with branches and often condenses into thin slices. In meteorological observation, the intensity of snow is divided into light snow, light snow, medium snow and heavy snow according to its characteristics.

Generally speaking, in the north, because the temperature is relatively high in autumn and it is scorched by high temperature for a long time, the temperature will drop slowly in winter, and sometimes the temperature will be abnormal now, so it will be hot in spring, but because the temperature in the northern hemisphere is not high, it will affect the phenomenon of snow in the north in spring. In fact, it is normal to snow in spring. In the snow is also called Peach Blossom Snow in March. Generally, it doesn't rain too much. It will be cold when it rains, and it will clear up soon after it rains. After all, the temperature is rising in spring.