Heres the strange thing. My understanding of relative humidity is that with temperature change relative humidity changes. The colder the more likely for higher relative humidity. However the last couple of days my relative humidity has been sky high. Over 90% when the temperature has been really mildThe more breathable the loft, the closer the temperature and humidity will be to the outdoors.
The other thing is, the humidity reading you're looking at will be relative to temperature, so the reading will fluctuate with temperature, regardless even if there is no change in amount of water in the air.