When does the snowline move?

Snow lines are clearly visible on mountains. They mark out the area above which a mountain is permanently covered in snow. The highest points of a mountain are much colder than the lower points. The snow which falls on the higher regions never thaws because it is so cold. In the summer, however, the warmer weather begins to melt some of the snow. This causes the snow line to move the mountain. As the summer months pass by and the winter months return, the snow lines further move down the mountain once again. In colder regions, the snow line is close to ground level, but where the air is warmer; the snow line is closer to the equator.