Of all the sensors on a weather station, the anemometer is the one most thoroughly defeated by bad placement. You can buy the finest wind sensor made, bolt it to a fence post beside the house, and it will faithfully report numbers that have almost nothing to do with the actual wind — it’ll measure the swirl and shelter of your particular corner of the garden instead. Getting wind data worth having is mostly a question of where you put the thing, not what you spent on it.
The international standard, the one official weather stations follow, is to measure wind at ten metres above open ground. That height isn’t arbitrary: closer to the surface, friction with the ground, vegetation and buildings drags the wind down and makes it gusty and erratic, while at ten metres you get into the smoother, more representative flow that forecasts and records are based on. For a home setup, ten metres is often impractical, but the principle to take from it is simple — higher is almost always better, and every extra metre of clean height improves your data.
Just as important as height is clearance from obstructions, and here there’s a useful rule of thumb borrowed from the professionals: your anemometer should sit a horizontal distance of at least ten times the height of any nearby obstacle away from it. A two-metre fence, then, wants twenty metres of clearance — which immediately shows why so many backyard installations are compromised. Obstacles don’t just block wind; they create turbulent wakes downwind and zones of accelerated flow around their edges, both of which corrupt your readings in ways that aren’t obvious from the numbers alone. Trees are especially troublesome because they change with the seasons and flex in the wind themselves.
The most common and most effective home solution is a rooftop mast. Mounting the anemometer on a pole above your roofline gets it up into cleaner air and clear of ground-level shelter. The compromise is that the roof itself disturbs airflow — wind speeds up over a ridge and forms eddies in the lee — so you want the sensor mounted as high above the roof surface as is safe and practical, ideally a couple of metres clear of the ridgeline, not tucked just above the tiles. A chimney or a sturdy gable end can serve as an anchor point for a mast.
Be realistic about the trade-offs your specific site forces, because almost everyone has to make some. If your station uses an all-in-one sensor array, you face a genuine dilemma: the ideal spot for the anemometer (high and exposed) is the worst spot for the rain gauge and thermometer (which want to be lower and shaded). This is one of the strongest arguments for a system with separable sensors, where you can run the wind sensor up a mast and keep the rest at a more sensible level. If you’re stuck with an all-in-one, prioritise getting it clear of the immediate house and as high as the mounting allows, and simply accept that the other readings will be slightly compromised.
Finally, give a thought to orientation and the wind vane that usually accompanies the anemometer. It needs to be aligned to true north, not magnetic north, and most setups have a marked alignment point or a calibration step in software to set this. A wind direction reading that’s thirty degrees out because nobody aligned the vane is a surprisingly common and easily avoided error. Once it’s up, high, clear and aligned, leave it — and enjoy the quiet satisfaction of wind data that actually agrees with the trees bending around you.