Yep, I could be the local weather body. I have two 15" titanium rods and 20 screws. When the weather fronts start to come through I seize up and ache so bad that I could writhe on the floor and moan. Cold doesn't help much either. I asked my dr. about this and he said that yes, it was because of the hardware. Great, just what I wanted to hear.
Now when I hear that there is front coming through I make sure that I have meds in my body to help stave off the pain that I know is going to happen.
For me, the best thing is to sit in the hot tub. The warm water seems to help pull the pain out from the deep inside areas... I also wear many layers at work. They kinda of chuckle, but understand. A couple of the guys said that they gauge the weather by how many layers I have on!
So I wouldn't stress too much about it. It seems to be one of the universal by products of the surgery.....