The stability at room temperature will be dependent upon the moisture levels of the raisins and the relative humidity of the atmosphere. In addition, precautions against insect damage are necessary. If the storage room temperature and relative humidity are high, refrigerated storage may be adopted for short periods of time. Raisins then neither gain nor lose moisture. Controlling the relative humidity is particularly criticial if the storage temperature is not optimal.
Lower temperatures slow the moisture transfer rate from the air to the raisins.
Poly-bags and proper packaging help to protect raisins in high humidity conditions.