Saskia,
Winter is a wonderful time to walk but you must be PREPARED!
Be sure to read the tips and advice which others and I have posted
in this earlier thread.
Since you suggest Logrono as your starting point do be aware that in bad weather many steep descents on the camino would be treacherous and following smaller parallel roads might be necessary for example the stretch west from Najera to Santo Domingo de la Calzada. However, Christmas at Granon should be a wonderful experience since every night at Granon is so special. Their open fireplace is a cozy spot on any winter night!
Sillydoll who is a Forum member has compiled encyclopedic information on Winter Walking at >>
http://amawalker.blogspot.com/
Other good accounts of winter walking by a Forum member are these 2010 and 2013 blogs at >>
http://agoodwalkunspoiled.blogspot.com/ .
Happy planning and Buen camino,
Margaret Meredith