Hi Schubaba, non French speaker from Devon, UK here. I walked from Grabels, 9km past Montpellier, to Castres, jumped 4-5 sections to Toulouse and then walked from there to Lourdes and took another route over the Pyrenees, last May/ June.
I think you would have to be very unlucky to have snow on the route as it goes through the Haute Languedoc in May, usually it is quite mild, last year was unusually damp with cold winds. There was whole days I did not see any pilgrims while walking but would meet some in the Gites. Another pilgrim who posted on here and walked a week or two ahead of me did not see any others. Essential books to take are the Miam Miam Dodo guide for the Arles route, the format is easily understandable by non French speakers, and take the French Randonee topo guides, the 1st one from Arles to Toulouse and the next one on from there to the Pyrenees, the maps used are invaluable.
The Gites on the whole are quite good and plentiful, I ignored the recommend sections and eased my way over hills at the start, the trails are quite rocky and difficult in parts, save your long days for the sections next to the Canal du Midi and after Toulouse. The climb up from St Gervais sur Mare will take it out of you, try to break it up, I stayed at little departmental Gite about 2km off route, half way into it. In Angles I stayed in the private albergue because I heard the municipal one was a dump, next time I take my chances with the dump and maybe tidy it, the owner of the private one was trying to sell up and you could feel it, short of locking you in a dungeon it was not possible to be made more unwelcome, saying that the Gite itself was beautiful, so maybe if you could find a more tranquil inner place than me and the other pilgrim did it might be worth staying there.
After Toulouse( 2or 3 stages) Le Grange is a must stay Gite, the owners worked as Hospitaleros at Granon and have a strong connection to the Camino.
Its a beautiful route, some days are deep inside of me, cannot quite recall what I was experiencing but the remoteness and the wind blowing through the trees quitened me. The pilgrims I met who had walked the le Puy chemin said it did not stand out as being harder just less infrastructure, one Dutch pilgrim said it was like having Tunnel vision, being stuck on long forest tracks, while Le Puy he said you always had more open vision of the beautiful areas around you, maybe but it still felt special in the Haute Languedoc
Good luck and Bon Chemin