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.
1 It's cold-The tundra is the coldest of the biomes. 2  The average temperature in the tundra is around -18 degrees F. 3  It gets much colder in the winter and warmer during its short summer. 4  It's dry-The tundra gets about as much precipitation as the average desert, around 10 inches per year.