After a general introduction on the cause of wind, the dependence of wind speed increase with height on surface roughness and atmospheric stability is discussed. For the purpose of wind load calculation on structures this speed increase is often approximated by the pth power of height where the exponent p varies both with roughness, stability and the height of the layer in question. The last mentioned variation implies that extrapolations of p above its determination height cannot be depended upon. Wind gusts are turbulent phenomena of which the statistical frequency distribution can be analysed in a power spectrum. Generally the wind turbulence decreases with increasing height and stability. Gives method for calculation of wind loads.