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 Biome. In the tundra, conditions are cold, with an annual average temperature less than 5 C, and precipitation (mostly in the form of snow) less than 100 mm per year (see figure at right). The summer is brief, with temperatures above freezing lasting for only a few weeks at most.