In reply to Fruit:
Been checking conditions as I have a long weekend in the Jura at the end of the month. Much less snow than usual for the time of year at the moment but seems to be improving, at least from looking at a selection of webcams.
http://www.espacenordiquejurassien.com/ seems fairly reliable, at least based on previous visits. If you enlarge the map & hover your mouse/cursor over the coloured lines you can see what's officially open/closed
Post edited at 13:51