One of the common complaints to develop from the cold (and damp) is Chilblains.
Chilblains are cause by warming cold or damp hands up to quick, the added heat, intenseness, and sudden rise in temperature cause the blood to rush back into the hands before the arteries and veins have fully opened again.
Because cold wether constricts the arteries and veins the blood flow slows down, this adds to the numbness and coldness the hands feel.
Blood likes to travel warm and when it can flow correctly it can help maintain the body in many ways.
Part of the hand problem is a design one, it is just so easy to put them close to a heat source.
Because we can stretch out our arms we can put our hands close to heat sources under our heart line.
This means the not only does the heat open up the arteries and veins but it draws blood in to that area.
So if to much blood comes in, the smaller arteries "leak" and if the veins cannot get the 'old' blood out fast enough, then it is like a small concertina effect as the new fast moving warm blood is slowed down by the old slow moving colder blood.
By letting the body naturally heat up all 'body systems' regulate at the correct speeds so now one part of it is ever overloaded. (think conserve body heat in cases such as Hypothermia and introduce new heat slowly and gradually)
The best advise in the cold is wrap up and protect yourself from it, do not allow it the chance to take hold.
Heat can be just as detrimental to our health as well if we are in the sun for to long, we need to protect ourselves from the elements if they will affect out health.
My mother taught us " no such thing as bad weather....just wrong cloths".....I find that applies in all situations hot or cold.