International standard measurement of wind at 10m above ground [up a steel lattice mast in UK], ideally near runway ......... customer iffy about anything near runway so mast sited a LONG way from significant obstructions which could disturb wind flow. Obstructions certainly do give values untypical of those at the runway, sometimes blanking gusts, sometimes giving "false" gusts, and very often giving wrong wind direction, even reversal.
In extreme cases, the sudden arrival of a sea breeze or a storm down-draft may not be picked up in time. RAF Nicosia really needed two anemos, one at each end! The sea breeze was often massive, slamming doors and blowing off the staish's cap.