Wind speed and altitude
The hypothesis that the anemometer located at the highest point above the ground will measure the highest wind speed has been proven to be true.
Wind speed gradient and turbulence are very important factors to consider when selecting the height for installing wind turbines. The wind turbine must have a high wind speed and as little wind turbulence as possible. Light wind turbulence can affect the performance and efficiency of the wind turbine while large amounts of turbulence can reduce its operating life, or even damage it.
The experiment may be repeated by using wind socks positioned at various heights, with the angle of the socks as an indicator of wind speed.
The experiment may also be repeated to compare the results obtained at different locations, such as the seaside or in an open field.
Wind gradient - http://en.wikipedia.org/wiki/Wind_gradient
Wind turbine FAQ - http://www.rpc.com.au/products/windturbines/wind_faq.html
Measuring the wind - http://www.rcn27.dial.pipex.com/cloudsrus/measurewind.html