What are the conditions necessary for the formation of sand dunes? Hi, Dunes are formed by interaction with the wind. Wind speeds of 10 to 20 mph,. are necessary for sand to start saltating under the direct pressure of the wind.
Winters are very harsh in Tundra climate. Winter months temperatures are usually between -18 and -50 degrees. Summer temperatures range from 35-50 degrees. High latitudes are the main cause of of the low temperatures. These areas mainly receive indirect sunlight.
The tundra climate is midway between sub-arctic and ice cap climates. Tundra conditions exist throughout much of Greenland, in parts of Alaska, northern Canada and in northern Russia. Typically, a tundra will only exist between latitudes of 60 and 75 degrees North.he city of Nome, Alaska, is in a tundra environment. The city's annual precipitation is 18.4 inches per year. By contrast, Point Barrow, the northernmost United States city, has an annual precipitation of 4.3 inches.