Control of granule compressive properties is important for making higher reliability ceramics. In this paper, the effect of ambient conditions (temperature and relative humidity) during preservation and compressive strength is examined for irdividual granules. The compressive strength of the individual granule was fand to depend on the ambient greatly conditions. The reason is explained qualitatively in terms of the relation between the glass transition point of the PVA used as a binder in the granules and the relative humidity.