This pattern may occur for whatever reason. The fact is, pure and simple, that patterns do exist, but they cannot always be explained, nor are they guaranteed to repeat. On the other hand, some things, such as the planting and harvesting of Soybean crops, occur each year like clockwork. Remember though, no price pattern is ever guaranteed to repeat itself past performance is no guarantee of future results. It is critical to remember that past performance is no guarantee of future results.
Seasonal analysis is merely another tool for futures traders.
Seasonals should not be used in a vacuum, and the analysis and data should not be considered trading advice or recommendations. It may also have absolutely no significance to day-traders. Just as seasonals can be applied to futures contracts, so to can seasonals effect spreads. Spread trading involves following the difference in price between two futures markets. For instance, an example of an intra-commodity spread would be if you simultaneously bought July Corn at 2.25 and sold December Corn at 2.34, you would have entered the spread at 9 cents.