@idefix37 thank you very much for your answer!

Good morning guys, I need some help with the interpretation of the meteogram. In the locality where I live, it seems to me that today (saturday) meteogram windy did not predict the presence of haze and low clouds, which the local weather station of another application did. It is haze and clouds at an altitude of about 800 metres. As you can see, the sky above this layer was perfectly clear. Have I misinterpreted the meteogram? According to the attached data, was it possible for me to predict this weather situation? Many thanks for your help