No, this mod idea isn't a mod that focuses on wind effects or sounds, but rather what wind does in real life.
One of the examples that occurs to me as the most noticeable example would be arrows. Depending on the wind, it could affect the way the arrows move. For example: During light wind, arrow's won't have a noticeable change whilst flying. However, during more heavy winds, the arrow will start moving towards one direction (If the arrow is move forward, the wind is moving west, the arrow will get pushed too the left).
Another example would be boats & minecarts. If the wind is strong enough (Doesn't even have to be that strong), Boats and Minecarts will start moving without the assistance of an object/orientation.
Finally, if the winds are strong enough, walking against the winds may slow you down, and sprinting in it could drain your hunger faster.
On the aesthetic side, the mod would possibly involve making the rain fall in a directing that isn't straight down (Falling at an angle)