Which times of the year should products be offered at full price and which should be offered discounted?

It is helpful to look at the seasonal trends (if there are any) of the particular product.

If a product is in strong demand in the summer or warmer months, the seller can offer the product at full price, as there will be a buyer who will more then likely purchase the product due to their need and strong demand for it. Therefore, during the colder or winter months, the seller may decide to reduce the price and offer the product at a discount due to a decrease in demand. Hopefully the lower price will entice a consumer into buying the product regardless of their need or want for it.

For example, if a business sold umbrellas, it could be beneficial to offer the umbrellas at full retail price during the winter months, because that is a time when consumers may have no choice but to purchase the umbrella. Conversely, during the summer months, the business could offer the umbrella at a discounted price to encourage consumers to purchase it, even if they do not need the umbrella at that point in time.

The same principles can be used with nearly all products, including clothes (winter/warmer or summer/cooler clothes), foods and household items.