I started on the 27 October in 2010. The day I crossed the Pyrenees it was in the low 70's and was a clear as it could be, I met a couple who started a few days before me and encountered real problems on the climb with conditions turning nasty, also met people who started a few days after me who had perfect weather for the crossing, you do not really know what's going to happen until the morning of the crossing so seek and heed local advice as much as you can.
The weather was more or less perfect for the whole walk, apart from two days of crazily strong winds on the meseta and an absolute downpour after passing La Faba which had turned into a snow blizzard by the time I got to Laguna Castile. I was bit lucky people who I knew who were a day or two ahead of me were regularly getting snow blizzards, and people who were behind me by a day were holed up on a couple of occasions because of extreme conditions. So you never really know what is going to happen, to use the phrase which has been used on here a lot..Prepare for the worst and hope for the best.
If you are starting near the beggining of November you could see around 20-30 pilgrims at various points around every day, a lot more as you get closer to Santiago, there is holidays in Spain usually at the end of November/beggining of December, I met a lot of Spanish who were making pilgrimages to coincide with that, on top of that there is quite a few people who only walk for one or two weeks and they can start and finish anywhere.
There is quite a few albergues open, obviously not as much as the summer months but there is enough in November to make it not a problem, it is worth checking ahead sometimes but usually I just wondered into a place and something showed up.
Burn Camino