I've done a few winter bike trips in southern Spain when the weather was good - blue skies, 15-20C etc and really enjoyed it. If you get lucky it can be better than summer where 40C can make you wilt somewhat.
However, it's not always like that and the further north you go round the coast the more likely you are to take a hit from the weather. I set out last January to ride the Med coast down to southern Spain (and then over to Morocco) and got this in France -
OK, you'd probably expect some snow in the winter but even when it wasn't snowing it was raining all the time, with loads of roads closed through flooding. After being wet and frozen for a week and the forecast telling me I had another 1500 miles of the same I gave up and went home.
You might be made of sterner stuff and be better equipped than me but thousands of miles of nothing but wet road dark skies misery isn't a bike trip, it's an expedition. Set off with that mind set and you'll be ok. If the sun does come out think of it as a bonus.
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