Cold,dry climate with snow and ice cover

The past tense of snow is snowed. The past tense of cover is covered.

Much of the northern part of North America is covered with snow during the winter, but for more southern parts of the continent, snow can be very rare. See the Related links for a link to the Rutgers Global Snow Lab, which offers a variety of snow cover charts including daily snow cover and snow cover anomalies.

Global warming is accelearated by the reduction of global snow and ice cover?

It is under the cover between the blower and the motor.