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.
At the lowest altitude that the Alpine tundra can appearat (about 10,000feet) the average summer temperature is-12 to 10 degreesCelsius.During the winter, the average temperature is about temperature -57 to -7 degrees Celsius.t the lowest altitude that the Alpine tundra can appearat (about 10,000feet) the average summer temperature is-12 to 10 degreesCelsius.