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.
Tundra climate areas experience a a very harsh winter and a cool summer. During the summer, much of the snow and ice melts and forms soggy marshes and bogs. However, some of the deeper parts of the soil stays frozen even through the summer--a layer called permafrost, as in permanent-frost.