Here's a breakdown of cloud heights:

* High Clouds: (5,000 - 13,000 feet) - Cirrus, Cirrocumulus, Cirrostratus

* Middle Clouds: (6,500 - 20,000 feet) - Altocumulus, Altostratus, Altostratocumulus

* Low Clouds: (Surface - 6,500 feet) - Stratus, Stratocumulus, Nimbostratus, Cumulus, Cumulonimbus

Let me know if you have any other questions!