In reply to BStar:
monday/tuesday looks like a good weather window around Zermatt/Cham (until another storm sometime on tuesday afternoon), just watch out for all the fresh snow as I spoke to some huts who had over 20cm of snow over friday and saturday and it is meant to be remaining cold at altitude for the next few days.
It looks like it should be improving everywhere towards the end of the week with (wednesday pm?) & thursday-sat looking good.
Post edited at 08:57