Thanks to all.
It seems to be a mainly a matter of luck with the weather and being prepared for anything - including, sometimes, stopping for a day or half day until things clear up or, in extremis, admitting defeat and taking a bus to the next stop if conditions are really dangerous (I'd really prefer not to have to cash in the plenary indulgence offered to those of us who die en route).
Unlike falcon269's brother, I'm more of a monk than a party animal, so loneliness is not a problem (although I was sad not to meet ANY other pellegrinos between Mombuey and Cea when walking in November 2010, and only 2-3 between Merida and Salamanca).
The change in seasons does make it more difficult to pack tho' - as lovingkindness says, if one could pack for the very different conditions in Andalucia/Extremadura and Leon/Galicia that would be fine, but I'm sure one of the reasons I managed to get through last time was only having about 10-12kgs to carry every day (not counting water, of course). And I was very lucky in only having 2-3 drizzly/dull days and one unpleasantly wet one (down from Fuenterobble), whereas starting later on and taking longer presumably makes it less likely that I'll be so fortunate this year.
Going through three seasons in one month was amazing (late summer in Andalucia, with temperatures in the high 80s, (mostly) gorgeous autumn in Extremadura and Leon, and occasional winter snow and frost over the passes into Galicia, and again at A Laxe, where the heating at the albergue was non-existant and there were no blankets).
But I'm quite sure that my slightly pig-headed insistence on doing the Via in only 30-31 days last time reduced the overall pleasure of the camino, wonderful tho' the experience was. Which is why I'm determined to be more flexible and allow at least a week longer to do it this year. And I'm sure that being in SdC for Xmas Mass must be quite something, even if (or perhaps slightly because) there may be very few other pilgrims arriving then to share the joy with.
So if anybody else is planning on leaving Seville around the 18th of November, or Salamanca about the 5th of December, give or take a day or two, then I hope to see you out there. And any other thoughts (packing, best places to stay, how to cope with the really long stretches between Cacares & Canavaral, and Galisteo & Aldanueva, what to do if the albuergue is closed, etc) very gratefully received.
Buen camono.