Nice tkaraszewski, always better with weather station data, as handheld meters are useless in this very respect about how low you can go (but to good use for the individual).
Having said that, I have to say even the "much better" weather station data with average winds and calibrated stations, are not fully the thruth either.
They are at 10 m height yes, and most often in very free areas just at the coastline.
BUT, as an example - we got one (out of many, but you learn to know these) that show the wind correctly most of the time.
Then in a very specific wind direction South to SouthSouthWest, there is a very small 1 or 2 meter high crest a bit away from the otherwise free wind meter, and at a specific windstrength, above 10 m/s, there comes a rotor, so it shows way to little.
It could be 15 m/s just next to, where we ride with our smallest kites 4-5 m2 now, and meter is only showing 9 m/s.
If the direction changes a bit, then it might jump up to 15 m/s which is more correct.
The opposite can also happen, in two other specific wind directions, wind passes around along a ridge far away, accelerates, and ends up on the wind meter - so in light winds it quite often show too much, say 5 m/s when there is around 3 m/s only.
Same can happen if it is somewhat close to an "end" of a ridge, with passes around instead of over, at the ends, and accelerates to much more than the real wind a bit further out.
Goes without saying, they can often show too little, in wind directions where obstackles behind or in front influences.
Then you have the validation of how well calibrated they are, might be a bit off.
In general though, it seems they (ours, can not speak for others) are often calibrated and my experience having put many wind meters up in several locations, is they are pretty accurate, also over time and use and weather.
The major error in wind stations is as said, other obstacles that changes the wind at the very measuring point, and not the meter itself, in my experience the last 41 years with sailing and flying.
Have been working with calibration and accuracy for 35 years, and find it interesting so always observe and deduct, to understand.
Besides this, we have a couple of other factors, even more important.
Wind gradient, mostly when riding with long lines it matters hugely. Not THAT often it makes a lot of difference though, here, with normal lines.
The most classic is that there is wind a bit up 10 to 20 meters, and then you can have almost glassy water surface, so you can ride, but if you drop the kite, you can hardly drift ashore as no wind - happens quite often with this "close to zero" wind at the surface, but easy to ride when you keep the kite up.
Air temperature matters a bit, when winther there is more power in the wind. Not a drastic change though, but some.
IMO by far the most important thing is "wind quality".
You can have gusty wind where easy to feel, and it can have a bit less power than average measured wind.
But you can also have "mini" imperfections, small bubbles in the wind you can not feel in any way, I call it "cheese wind".
These can make 4 to 5 m/s wind almost unrideable, eventhough it feels smooth and good.
The direct opposite is silky smooth perfect wind.
In this wind it can be possible to ride in 3 m/s wind only, with same gear where you could hardly ride in 4-5 m/s.
It just feels good riding in this
Current matters of course, but off topic as you have to measure the wind relative to the current, so you can have both more relative wind, or less, or the same (even in strong current), depending on direction.
Short version is:
Weather stations are a lot better yes, especially average wind, but not to be trusted either.
Handheld are mostly pretty useless for how low you can go, although often fine for an indication for the individual knowing "how to".