The weather has been fantastic so far in November i Galicia, we still have temperatures in the low 20c and sun. This might of course change in the next 10 minutes (weather changes fast here

, but the weather man "promised" nice and warm weather at least until Sunday (Nov 12th 2006).
I think November sounds like a good month to walk. But be ready for colder weather. 20c is not the normal temperature this time of year. As for some weather statistics, have a look here:
http://www.pilgrim-wiki.com/index.php?title=Weather
As for starting point, my guide books recommends 12 days from Leon, but I am sure it can be done if you do it in a hurry (a bad way of walking your camino by the way). What about starting in O Cebreiro, and then taking it easy leaving a day or so in Santiago and maybe a visit to Finisterre (bus or walking depending on your days left over).
Buen camino,
Ivar