snow line

the line, as on mountains, above which there is perpetual snow.

the latitudinal line marking the limit of the fall of snow at sea level.

Origin of snow line

First recorded in 1825–35

One of the pleasantest days we enjoyed was upon Mount Frias where a large point of cattle had gone up beyond the snow-line.

Through the Heart of Patagonia |H. Hesketh Prichard
It is only high aloft, close to and all above the snow-line, that man's energies have not availed to change the landscape.

The Alps |Martin Conway
We were climbing higher and higher, already above a lower range of mountains, and soon touching the snow-line.

Forty Thousand Miles Over Land and Water |Lady (Ethel Gwendoline [Moffatt]) Vincent
This middle region may be defined as limited by the snow-line above and the tree-level below.

The Alps |Martin Conway

In this latitude 7,500 feet is the snow-line, but Washington has many peaks above that elevation.

The Beauties of the State of Washington |Harry F. Giles

snow line

the altitudinal or latitudinal limit of permanent snow

snow line

The boundary marking the lowest altitude at which a given area, such as the top of a mountain, is always covered with snow.

The boundary marking the furthest extent around the polar regions at which there is snow cover. The polar snow lines vary with the seasons.