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.
At minus 21.8 degrees, its average for December, January and February is also the lowest in the country, according to Natural Resources Canada. The Canadian tundra experiences short summers of only 50 to 60 days, long winters and very low levels of annual precipitation.