@ Dorian : I have check your step-by-step nicely written tutorial on VinDSL's script when I built my conky. I think it's working quiet well now as you can see on the attached image.
The url from which I'd like to grab informations is this one : http://www.meteosuisse.admin.ch/web/...z=1200&x=0&y=0
I do like the "magic", but I prefer when I can understand what's doing in the black box. And I would like to know how to do it by myself in the future, that's why I was asking for a tutorial on "how to grab information from a website and pass them to conky".
Anyway. If a script comes out of "the magic", may it be with some comments on the code .
And finally, thanks for your literary description on how it works.
@ TBG : Nice. Thank you for this clue, I will have a closer look to the file .