With summer days starting to get shorter now is a good time to make sure the exterior of your house is protected for the winter.
This can be from some simple re caulking around your doors, and windows. Along with some minor removal of older flaking paint.
It could be that some caulking is needed were cracking or openings in the wood trim that could let in water and moisture.
Our it may be your house could need a complete repaint of your exterior.