I just moved from California from Texas and we are getting use to humidy. But my sugar,baking powder and soda are clumping and I don't know how to prevent them from doing this. I have never lived in humidy and I have never had this problem before. They are in plastic rubbermaid containers in my cabinet in my house. I have air conditioning that I run all the time so I don't know why they are clumping. Any help would be appreciated.