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 average winter temperature is -34 C (-30 F), but the average summer temperature is 3-12 C (37-54 F) which enables this biome to sustain life. Rainfall may vary in different regions of the arctic. Yearly precipitation, including melting snow, is 15 to 25 cm (6 to 10 inches). Soil is formed slowly.haracteristics of tundra include: 1  Extremely cold climate. 2  Low biotic diversity. 3  Simple vegetation structure. 4  Limitation of drainage. 5  Short season of growth and reproduction. 6  Energy and nutrients in the form of dead organic material.