@idefix37 and @Yves70
Now it is clear. I did not know that that the meteogram wind was given at 10m, basically at ground level. That explains the differences I noticed when comparing the airgram at up to 950hPa, which is the actual altitude of the take off place I am interested in.
Thank you as well for the suggestion to look for other models, I will do it from now on.
Kind regards and happy flying 2021!