Divination by observing substances in the air or wind; such as, cloud shapes, weather conditions, and atmospheric phenomena (comets, etc.).

Also this is divination that involves the direction of the wind as when throwing sand or dirt in the wind after asking a question, and receiving the answer in the form of the dust cloud; or throwing a handful of seeds into the air and receiving the answer to a question from the pattern created by the fallen seeds. Also known as austromancy.

For many centuries, humans believed that wind was actually the breath of their deities; alternately, some thought that specific types of winds, particularly hot winds, were the work of demons.

In medieval writings on divination, the term (usually spelled aerimancy) was expanded to include almost all phenomena occurring in the air.