In reply to CurlyStevo:
We mostly used this one which I can see is on your list anyway -
http://www.arpa.veneto.it/previsioni/en/html/meteo_dolomiti.php
Worth looking at the German & Italian versions as there is often a more detailed description that isn't too hard to translate.
Heres another one -
http://www.ilmeteo.it/Italia I think you can switch it into English. Seemed reasoanbly ok.