I'm white.I'm cold.I can fly in the sky.You can call me a flower,but you can't see me when it's warm.What am I?You are ( ).

I'm white.I'm cold.I can fly in the sky.You can call me a flower,but you can't see me when it's warm.What am I?
You are ( ).

you are snow,雪花,雪
我很白,我很冷,我可以在天空中飞翔.你可以说我是一朵花,但是 在天气暖和的时候 你是看不到我的,我是什么呢