This is a good time to check over your home for signs of moisture problems. Dampness can enter your home for many subtle reasons.
Water vapor can enter from the outdoors via the damp ground or leaky gutters.
Moisture can also be produced by indoor sources such as steam from cooking, humid air from a refrigerator defrosting or drying wet firewood. Condensation also forms when warm indoor air comes in contact with cold surfaces such as single pane windows or uninsulated walls.