1) Appropriate to the time 2) At some times of the year 3) Economic stat descriptor 4) Like berries and oysters 5) Like christmas and hanukkah 6) Like Christmas tree lots 7) Like fresh strawberries 8) Like many sales 9) Like most fruit 10) Like most major sports 11) Like resort venues 12) Like some allergies 
• (a.) Of or pertaining to the seasons.
Sea'son·al adjective Of or pertaining to the seasons. Seasonal dimorphism (Zoology) , 
Refers to a recurring process. Often data are deseasonalized to smooth out spikes and provide a better basis for analytical purposes. Examples of this would be sales of heating oil, gasoline, retail employment statistics, and other ecnomic and financial time series. 
[adj] - occurring at or dependent on a particular season
related to a season
To do with the seasons, e.g.; Winter. Not all year round.
Reference to a specific time of year when a product is available or when there is a specific focus on a product.
adjective occurring at or dependent on a particular season; `seasonal labor`; `a seasonal rise in unemployment`
an article that relates to a particular time of year.