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 temperature range is -65Â° F to 70Â°F (-54 to 21Â° C). For one half of the year, the temperature is below freezing. But the temperature is warmer than the temperature in the tundra. The taiga climate has an average annual rainfall of 12 - 33 inches (30 - 84 cm).Most of the precipitation falls in the summer as rain, but a portion of the precipitation does fall as sleet or snow in the winter.or one half of the year, the temperature is below freezing. But the temperature is warmer than the temperature in the tundra. The taiga climate has an average annual rainfall of 12 - 33 inches (30 - 84 cm).