Climate diagnostic studies combine data from different sources (radiosoundes, satellites, meteorological masts, etc) and meteorological models to predict the climate conditions and evolution at a particular site or globally. Products from climate diagnosis are archived in long-term databases that may constitute a useful tool for site characterization. However, a rigorous control of data quality, analysis and cross-comparison to in-situ meteorological measurements need to be performed before the method becomes extensively used for site characterization. We present a statistical analysis for wind vertical profiles, an important parameter for site characterization, using data from a climate diagnostic archive and in-situ measurements (ground-level and balloon data).