Here's why:
* Concrete nouns refer to things that can be perceived by the senses (sight, touch, smell, taste, hearing). You can feel the wind on your skin, hear it rustling leaves, and even see its effects on objects.
* Abstract nouns refer to ideas, concepts, emotions, qualities, etc. They are not physical things you can touch or see.
While wind is a force of nature, it has a physical presence and can be experienced through our senses.