Below 18.6% moisture content is considered honey. If you hunt around here and on other forums you'll find people's crop ranging from 11% to 22 or 23% but 16-18% is about the norm for bottling honey. Less than that and it will be dry/stiff and harder to bottle, more than that and it is likely to ferment, which is great for mead but not what you want to sell to customers or giveaway.
There are a lot of forum threads about people trying to dry their crop out a bit, particularly those that live in a humid climate, if you're in an arid area it doesn't seem to be a problem. Honey is hygroscopic which means it will absorb moisture from the atmosphere, so the longer it sits around exposed to moist air, the more it will absorb (to a point).