snow line

noun
1.
the line, as on mountains, above which there is perpetual snow.
2.
the latitudinal line marking the limit of the fall of snow at sea level.

Origin:
1825–35

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Collins
World English Dictionary
snow line
 
n
the altitudinal or latitudinal limit of permanent snow

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
snow line  
  1. The boundary marking the lowest altitude at which a given area, such as the top of a mountain, is always covered with snow.

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


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The location in the photo above is approximately the base of the snow line in that mountain in the distance.
Letters to the editor on the snow line and dark energy.
During spring snow melt, they again move up slope following the snow line and breeding activity begins.
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