Lucky you to be walking soon again! However the Meseta in winter can be frigid when the wind blows from the west into your face; be prepared!
Furthermore in cold weather never choose an albergue bunk placed against an exterior wall since old walls are often uninsulated and thus frigid. All night heating is not the norm hence make a cozy 'sandwich' for sleeping by folding a blanket in half the long way, place your sleeping bag on top of the bottom half and pull the top half over all. If there are no blankets put your poncho beneath the bag to block the cold air from rising.
Runner's winter tights, a long sleeve runner's shirt and a wooly hat are great to wear to bunk/bed wben it is really cold. Over the past years the coldest I have ever slept on the camino was late February 2006 in the then unheated
Hornillos del Camino municipal albergue. Breath hung white in the frigid interior air and ice formed in the toilet bowl. Nevertheless dressed as above I was snug in my sleeping bag and liner.
Stay warm and safe. Buen camino and, as always, Ultreia!