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.
Learn more about Tundra Plants and Tundra Animals. What is the Tundra Climate Like? The tundra is the coldest biome in the world. Winters are cold, dark and long. There are several weeks where sun never rises. The average winter temperature is well below -34 degrees Celsius and can fall to -70Â°C in extreme conditions.