Moisture content for safe storage of aerated grain. Managing Dry Grain in Storage. Iowa State University. Ames, IA 50011. Winter grain conditions and air-moisture migration.
Grain typically has good insulation properties.
As storage extends over several seasons, the center mass of grain remains about the same temperature as it was at the time of storage. As outdoor temperatures fluctuate with the season, the outer layer of grain changes in temperature. This causes slow movement of both air and moisture. Air and moisture movement in stored grain will occur when grain temperature and the outside ambient temperature differ. This natural circulation occurs when heavy cool air drains down through the grain near the outer edge of the bin and moves upward after warming in the center.