Moisture in the refrigerator compartment
Why is there dew or sweat in the refrigerator compartment?
Some moisture in the refrigerator compartment and crisper is normal. Light sweat or humidity may build on interior walls, shelves, bottles, jars and other containers in the refrigerator compartment.
Moisture in Main Refrigerator Compartment
Excess moisture can be a result of the following:
Opening the doors frequently:
Opening the doors frequently can cause sweat or dew to build in the refrigerator compartment. When the doors are opened, humid room air enters the refrigerator. The more often the doors are opened, the faster the humidity builds. Opening the doors less often will help, but may not completely eliminate internal moisture.
During months of high humidity weather here in Florida (especially if a home is not air-conditioned), it is normal for some sweat or moisture to build inside the refrigerator when the room air is humid.
Blocked air vents
Make sure the air vents between the freezer and refrigerator compartments are not blocked. See images below. Objects blocking the vents will cause a decrease in proper air circulation, which can cause temperature and moisture problems. Move any items that could be blocking the vents.
Poor gasket seal
Moisture buildup around the door or on the ceiling suggests an air leak, likely due to a gasket problem. The door gasket should seal all the way around on the door. Make sure that nothing is keeping the gasket from making a good seal.