Lack of circulation i.e. low blood pressure and / or dehydration. Lack of electrolytes.<br />
Cold weather can fool the body into not being thirsty. Also during winter months diet is often lacking vegetables/nutrients. You might try vitamin and mineral supplements. Ensure you have proper amounts of sodium, iodine, chloride = table salt and magnesium, potassium, phosphorous and calcium in your diet. Vitamins D, C, B complex are also recommended.
Most people tense up in the cold. Check to see if you are tensing your hands or making a fist,as i sometimes do this when its cold and it causes cramp. Wear warm gloves whatever you do.
Check your salt levels too,as a lack can cause cramps.
fluid in your body slows down in circulation.
In the cold,your body shuts down blood vessels close to the skin surface to preserve heat..Because of the fingers high suface area to mass ratio,and because they tend to be exposed,they are the worst part of your body to suffer from lack of circulation..
Poor blood circulation may be the cause of it, I use ginger quite a bit in the winter to help with that. If you are drinking a lot of soft drinks they can flush minerals from your body, such as magnesium that will help with cramps in muscles, you can take a warm bath in Epsom Salts to replenish them or take a tablet.
I agree, welcome to the wonderful world of arthritis
Body is trying to retain heat so it distributes it to your core. Frost bite typically occurs at the hands and feet since body tries to reserve heat in the center of your body.
Pop your joints. There is to much fluid build up between them.