?> I mean, if I measure humidity at different height/depth inside a drum, 
should it increase or decrease while going down. The drum were left outside 
during 6 months.

You don't say  how the drums were filled, if it granulated quickly, or not 
or how well the drums are sealed.

Normally quick granulating honey will be quite uniform from top to bottom. 
If the ambient temperature and humidity varies a lot, then the drum will 
have inhaled and exhaled a bit and the top few cm will be moister than the 
rest.

If the drums were sitting in full sun, the exposed side could be more liquid 
and darker. If the seals leaked and water wicked in and the honey was 
granulated at the time, the water just sits on top and may ferment a bit, 
but the honey below will be just fine.  If water got in and the honey was 
liquid, chances are the moisture mixed in more.

Otherwise, one time I bought a truckload of honey that sat outside for years 
and it was just fine. 

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