As Alan above says “always a chance of rain anywhere in Europe in December but the best chance of warm sunny rides would be in the South of Spain.”
We at
http://www.bikingandalucia.com
have been based in Orgiva, Sierra Nevada, Andalucia, Spain for 12 years, and operate all year round.
We provide a weeks guided holiday for only 250 GBP and a 10% discount for Singletrackworld members.
The area offers superb biking, including tough climbs and long descents, miles of technical singletrack, as well as more gentle trails. We use our unrivalled local knowledge to provide a customised holiday based on what you want.
Also a lively town, Orgiva on your doorstep for the evenings!