Boston, I have severe arthritis in my back and it does seem worse with the weather. If there are big changes in the temperature I'm the first to know. I use alot of moist heat.
I lay on a heating pad with a moist towel. Maybe you can try that for your hand. If I do that for about 1/2 hour I do feel better. It can be very painful so look up some hand excersizes you can do on the computer. Hope your well soon. :-D