The south side of the building gets the worst weather.
Here in Sacramento, we find that the greatest amount of weather damage is found on the south side of the building. This side of the building gets the most sun which damages the material on that side. Because of the sun beating on this side, it is more likely to get water damage, dry rot, peeling paint and all sorts of things that will require regular maintenance.
Each of the 6 doors and frames in the photo are in need of replacement. The water damage and dry rot has gotten to the point that it can no longer be repaired. Regular maintenance would have prevented this costly repair.
When doing your regular maintenance inspections, be sure to pay particular attention to the south side of the building; it gets the most damage. A little bit of prevention will go a long way in maintaining your home. If you are not sure what to look for, contact a local contractor qualified in spotting areas in need of attention.