The Presidential Range is perhaps most famous for its tumultuous weather, highlighted by the erratic and often extreme conditions upon Mount Washington and its other summits. Being both at the intersection of several storm tracks and the center of multiple converging valleys funneling wind from the west, southwest, and south make its weather unpredictable and at times violent. The summits of the range have been known to see snow and ice in all seasons, and are subject to a combination of hurricane-force winds and blanketing clouds an average of 110 days a year. Mount Washington long held the record for the highest wind speed ever recorded at the Earth's surface, clocking , forcing summit buildings to be chained down so they won't blow away.