montane An altitudinal condition which inheres in a bearer by virtue of the bearer being located at an altitude between mid-altitude forests and the tree line. ORCID:0000-0002-4366-3088 The exact level of the tree line varies with local climate, but typically the tree line is found where mean monthly soil temperatures never exceed 10.0 degrees C and the mean annual soil temperatures are around 6.7 degrees C. In the tropics, this region is typified by montane rain forest (above 3,000 ft) while at higher latitudes coniferous forests often dominate. LTER:350 envoPolar altitudinal condition