Why does it snow in Qingcheng Mountain?

The weather is suitable. The winter in Qingcheng Mountain is about 3 to 5 degrees, the ground temperature is below zero, and the temperature of clouds in the sky is lower, so the weather will be suitable for snow. Qingcheng Mountain is the main scenic spot of Qingcheng Mountain-Dujiangyan, a world cultural heritage, a national key cultural relic protection unit, a national key scenic spot and a national AAAAA-level tourist attraction.