Seasonal Demand
Seasonal demand is the demand of certain products based on the time of year. an example would be there is a higher demand for toys during Christmas than any other time of the year as everyone is buying toys for their children.

Gifts this Christmas
This Christmas i got a guitar amp. I got this at Christmas because they tend to make more amps and products during this time of the year and the shop that it came from had ordered some in for Christmas  they had also had a 30 percent discount for the Christmas holidays. this was their tactic to sell more during the holidays.

Changing Demands
Demands change based on culture as different people celebrate different holidays. An example wold be that in countries were Christmas is widely celebrated there would be a lot of demand for gifts whereas a country where Christmas is not celebrated as much as other holidays there might be more demand on different days.
The weather can affect the demand of certain items as the need for different things changes when the weather changes. For example during the summer holidays when it is sunny and people go outside there might be a high demand for outdoor activities such as rock climbing or biking. During the winter there might be high demand for hot food and drink like hot chocolate and possibly candles.

Products and services that will change throughout the year
Products that change throughout the year could be things like outdoor activities which mainly occur in the summer. these might not be so popular in winter in countries that get cold as people might not want to do things in the cold. Things like laptops and phones might become popular during the winter as Christmas is nearing during that time and they are popular Christmas presents