The wind speed is what it is for your location. If your lot is sheltered by trees or the like, then what ever the wind speed is, it is. What could you even possibly adjust it against? The wind speed at the local, wide open airport?
One thing you have to keep in mind. Your weather reading are the readings for YOUR location, not a location 10 miles down the road.
I wouldn't adjust a thing.
Bob
Thanks. Indeed I had thought of that... the wide open airport, even though I'm a mere 3 miles away, is always going to have "uninterrupted access" to the wind; but that's not what is going on at my place -- by definition.
You definitely answered part of my question here... did people feel a need to enter an offset and compared to what?
Another way to look at it though is if I had a mast tall enough to raise the sensor 10 feet above my trees (tall order since they are probably 70 years old and probably a good 90 feet tall) I could sample the wind at something closer to my local "unobstructed norm". But short of actually erecting such a huge tower, I can't determine that.
The other less obvious question though was... even at the airport... there's factory calibration but is there a need to calibrate it again perhaps later when the bushings become slightly worn... or do they just go out and buy a new sensor every couple of years? How would they independently know the speed and thus become alerted to the fact that the sensor was out of whack? I partially have an answer for that... since they have a windsock and the windsock will only "fully extend" at about 15 knots they could use that to "back calibrate".
Lacking a windsock though I'm not sure how one could determine the accuracy of the anemometer.
Apologies for not being explicit in my question(s); perhaps I should of sorted out my questions more specifically.