That depends on the moisture content. From "The Hive and the Honey Bee" 1975 ed. p. 498 table 4.
Moisture content of 13.2%= specific gravity of 1.4510
Moisture content of 17.4%= specific gravity of 1.4212
Moisture content of 21.0%= specific gravity of 1.3966
From "The Hive and the Honey Bee" 1975 ed. p. 499.
"The moisture content of honey may change after removal from the hive as a result of storage conditions after extraction."
If you seal the 5 gal. buckets I doubt that it will absorb much moisure.
From "The Hive and the Honey Bee" 1975 ed. p. 416-417.
"Moisture can be removed through the cappings quite readily.
To accomplish this, warm dry air not over 95F is driven through stacked supers of honey. The rate of moisture removal depends upon the dryness of the air and the volume passed through the supers. Air dryness depends, to a large extent, upon the number of degrees the air temperature has been increased just prior to passing over the combs. In general, cool air which has had its temperature increased considerably will be able to remove more moisture from the honeycombs than air at room temperature which has been warmed through a narrow temperature range. The efficiency of this system may be increased by permitting the warm, moist air to escape, and by providing a separate intake for fresh air. A unit which is operating efficiently will remove from 1 to 3% moisture in 24 hours."
