Laura, I think you're on to something w/the cold and damp weather. My Creamsicle has CH and she parks her fuzz butt directly on the heat vent until she's warm enough. I also use a heating pad for myself and if I get up from the sofa, she lies down on the heating pad immediately. She's so fat b/c of her allergy meds that it's hard to believe that she could ever be cold but there it is. There is a space heater in the enclosed patio room but she doesn't sit in front of it. She likes to be directly on the heat vent. So I concur w/some others who have suggested that you talk to your vet about upping or changing her meds for arthritis pain. Cgirl isn't on any b/c she has improved over the years and my cat sitter said that she could hardly tell that Cgirl has CH. However, should the time come when I see that she's in pain or discomfort, I'll definitely start her on pain meds. Sweet little Amy, I just want to hug her.