That persons' behavior is, in part, a function of the information available to them, especially the quality of that information (actually/objectively, and perceived/subjectively).

Accordingly, seasonality of demand or supply within economics may, in part, be determined by the limited availability of information that would let persons plan accordingly for future periods. Looking ahead at temperature patterns — historical and recent, general trends —, for instance, to determine whether they ought to purchase a coat now versus later, when other, less-informed persons are all rushing in to the market. [One must be cautious, here, to avoid being either a NaifOrSophisticate, as suggested in IntertemporalChoice literature.]