"Speed distribution" refers to how fast or slow things are moving and how that speed is spread out among a group or population. It describes the different speeds at which something can occur, and how often each speed occurs. Full definition
The actual wind - speed distribution experienced by a turbine in operation likely will be different from the certified distribution; the actual distribution will be either relatively benign or relatively harsh. (windsystemsmag.com)
Users can view maps showing wind speeds at three different heights, overlay the data with any of the existing data sets in the IRENA Global Atlas, and use the Global Wind Atlas toolset to directly download data as well as generate statistics such as wind roses and wind speed distributions over a chosen area. (cleanenergysolutions.org)
Figure 2 shows a sample plot of kinetic energy densities resulting from the same wind - speed distributions shown in Figure 1. (windsystemsmag.com)