As a side note, I did some calculations with a lot of assumptions. If hive stores 15 L of syrup and assuming simple sugar molecular composition and 2:1 syrup cured to half the water being removed from the syrup, then metabolism of the syrup would result in 8.1 L of water and an addition 3 L of water would be released from the water in the syrup. Over 160 days and 1000 hives that would be 65 L of water released per day. (According to my calculations). That is a substantial amount of water being released but as Ian's reading are showing, it is not making much of a dent in the RH. Interesting.