I don't know why there needs to be different treatment of the camera when going from Singapore to U.S. The U.S. is a much more dry climate with low humidity so actually should be better for the camera. The colder weather isn't a big deal to the camera's themselves or batteries. Don't forget that these camera's are from Japan and Japan has very freezing area's as well. Sudden temperature changes might make a difference so I guess if you travel and put your equipment in the check in luggage compartment it is subject to extream temp changes but if you put in carry on should be no problem.