Ron,
The ultimate moisture content of any wood, i.e. air dried, kiln dried, etc., is going to depend on the temperature and relative humidity of the area the wood is stored. All wood, if stored in a constant temperature and relative humidity will reach the same moisture content eventually. For example, at 70 degrees (F) with a relative humidity of 65%, wood will reach an equilibrium moisture content of 12%. You should be able to find an "Equilibrium Moisture Content (EMC) Chart" on web sites such as the US Forest Products Laboratory. I got mine from Fine Woodworking.
Rob