Wind speed is normally measured in mph or kph, but can also be measured in m/s (metres a second).
Digital anemometers are very accurate, but the more basic plastic ones that many schools have aren't very good or accurate at recording light winds.
Anemometers are normally placed on top of buildings so that they are not protected from the wind and so they don't experience channeling of wind e.g. if an anemometer was placed in a corridor where wind was forced through the readings would be higher than normal.
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