i am thinking of getting a 20$ Proster.Proster Wind Meter Handheld Digital Anemometers Air Flow Meter Thermometer with LCD Backlight
Exactly right, Thomas. I shoot PB's to 600 yards regularly at my local range and have shot a few 1000 yard matches over the years. Trajectory for any firearm or air gun is the easy part and can be pretty well nailed down, especially if you have a range finder. Wind is a completely different parameter that you will never completely overcome. I've often seen wind moving opposite direction (or even upwards or downwards) downrange while only detecting a crosswind at firing line. And as you note, speed is completely variable as well as direction. I've also seen it shift from one direction to opposite downrange with no change noted at the firing line. Luckily it is not as likely at short air gun ranges but as people begin to shoot further and further with the air guns it will become more of an issue.
Agree with that, Mike. But at air gun distances you are much less likely to see noticeably different wind speeds and certainly much less likely to see different directions of wind. But in general I agree that any shooting does help one learn to observe and estimate wind.