Seasonal investing refers to the strategy of buying or selling certain investments based on the time of year. Some investors believe that certain sectors or types of assets perform better during certain seasons, and adjust their portfolios accordingly. For example, some investors may buy stocks in companies that sell seasonal goods, such as retailers that sell winter clothing, in the fall. Other investors may sell shares in companies that are dependent on warm weather, such as amusement parks, in the summer. However, it is important to note that there is no definitive proof that seasonal investing strategies are consistently successful, and they may not be suitable for all investors.