1) Climate 
The climatic snow line is the point above which snow and ice cover the ground throughout the year. The actual snow line may seasonally be significantly lower. The interplay of altitude and latitude affects the precise placement of the snow line at a particular location. At or near the equator, it is typically situated at approximately 4,500 meters...
(from the article `solar system`) ...to condense to their ices. They therefore remained small rocky bodies. In contrast, the large low-density, gas-rich outer planets formed at ... ...solar system, the enrichment of argon and molecular nitrogen detected on Jupiter by the Galileo probe is at odds with the relatively high ... [2 relate...the lower topographic limit of permanent snow cover. The snow line is an irregular line located along the ground surface where the accumulation of ...
Considered to be 500 feet above sea level. It is the theoretical altitude at which land is expected to suffer from severe winter conditions.
Altitudinal or latitudinal limit separating zones where snow does not melt during the summer season from areas in which it does. Similar to the concept of firm limit except that it is not limited to glaciers.
[n] - the line on a mountain above which there is perpetual snow and ice
the minimum elevation of snow lying on the ground or glacier surface; the snow line at the end of an ablation season marks a glacier's current equilibrium line .
Considered to be 500 feet above sea level. It is the theoretical altitude at which land is expected to suffer from severe winter conditions.
noun the line on a mountain above which there is perpetual snow and ice
The elevation at which snow persists throughout the year.