Siberia is typically classified as a polar region, owing to the dryness of the winter climate and has glaciers only in the high Altai Mountains, Verkhoyansk Range, Cherskiy Range and Suntar-Khayata Range, plus possibly a few very small glaciers in the ranges near Lake Baikal, which have never been monitored and may have completely disappeared since 1989. Between the years 1952 and 2006, the glaciers found in the Aktru Basin region shrank by 7.2 percent. This shrinkage has been primarily in the ablation zone of the glaciers, with recession of several hundred meters being observed for some glaciers. The Altai region has also experienced an overall temperature increase of 1.2 degrees Celsius in the last 120 years according to a report from 2006, with most of that increase occurring since the late 20th century.