Even small amounts of excess moisture in the air can cause food spoilage, so it's imperative to make sure your pantry is as dry as possible. To see if your pantry passes the test, tape a sheet of aluminum foil on the inside of a pantry wall that faces an exterior side of the house. Leave the sheet hanging for a few days, then peel the foil off the wall and quickly examine it; if there is any condensation on the side that faced the pantry wall, there is excess outside moisture. On the other side, it's excess moisture in the air.
ANDREWS MCMEEL SYNDICATION