The impetus that necessitates your ability to read wind speed in Miles Per Hour (MPH) is of course long range shooting/hunting, particularly a rifle and hitting your intended target. The further the distance your bullet has to travel to a target or a game animal, the more time the wind has to push it in a given direction. As a hunter I have had a deer at 300 yards a few years back. It was cold, drizzling rain but the wind was nearly still. I trained some time ago to watch grass, bushes and trees and dust and sand to get a sense of wind speed. I pulled the shot off in part because there was little wind and I created a bullet drop and wind chart and taped it to my rifle. But I should have even been better prepared with a wind meter in hand to train with.  Of course the most recent person to drive home the importance on this ability is Brian Litz of  Applied Ballistics LLC.

Practice by guessing at wind speed then taking a hand held wind meter out to check your guess is a good simple way to determine wind speed and train yourself to see grass,bushes, tree limbs and trees move at say 0 to 5, 5 to10 or even 10 to 20 mph. On a hunt you may have to decide to “shoot or not to shoot” based on distance and wind.

Equally Important is what angle the wind is coming from in relation to your bullet. Milletsights.com has  a web article that does justice to your knowledge of wind and direction et al.

 http://www.millettsights.com/resources/shooting-tips/shooting-in-the-wind/

There are lots of wind meters on the market so just type hand held wind meters for sale and you can see a full range of them for 20 dollars to over $100 depending on what you need. So check around for cost and quality.

Some of best in class are the Kestrel Meters. https://kestrelmeters.com/

Since I may be faced again this fall with a longer shot at a deer on a windy day.  Make that shot count by training in advance of the hunt.

Good Hunting!