Answer:
Most meteors burn up high in the atmosphere, or explode when they hit the thicker part of the atmosphere. Air friction will vaporize all but the heaviest of meteor materials.
Meteor showers occur when the Earth passes through large belts of orbiting rocks. Some regular periods of highest meteor activity are named for the astrological constellations in the part of the sky in which they occur :
Quadrantids (January)
Lyrids (April)
Eta Aquarids (May)
Perseids (August)
Orionids (October)
Leonids (November)
Geminids (December)