There are many cloud types which include:

• cumulonimbus (thunderheads): near ground level to above 50,000 feet.
• cirrostratus: above 18,000 feet.
• cirrus: above 18,000 feet.
• cirrocumulus: above 18,000 feet
• altostratus: 6,000-20,000 feet
• cumulus (fair weather): below 6,000 feet
• stratus: below 6,000 feet.