What is not rain, snow or ice?

Sleet refers to semi-melted snow (wet snow), or a weather phenomenon in which rain and snow come at the same time. It mostly happens when the near-surface temperature is slightly higher than 0℃. Usually in the south.

Snow and rain are caused by clouds in the air or small water droplets that condense when cold. But it needs a nucleus in the early stage of its formation. This core is usually affected by dust in the air. When the temperature gets cold, the temperature of dust drops faster than that of water droplets. At this time, small water droplets will gather and attach to small dust to form larger water droplets. When it is bigger than air, it will fall, and it will fall bigger and bigger, thus forming rain. When the temperature in the sky is very cold, it is not raining, but snowing or hail. These things happen at high altitude, but if the temperature is high at low altitude, some snow will melt into water and turn into rain and snow when it reaches the ground.