The Correct spelling is: seasonal
Common misspellings of the word seasonal are:
How do you spell seasonal?. It is not
Of or dependent on a particular season.seasonality sea'sonÂ·al'iÂ·ty (-zÉ™-nÄƒl'Ä-tÄ“) n.
seasonally sea'sonÂ·alÂ·ly adv.
USAGE NOTE Seasonal and seasonable, though closely related, have different uses. Seasonal applies to what depends on or is controlled by the season of the year: a seasonal rise in employment. Seasonable applies to what is appropriate to the season (seasonable clothing) or timely (seasonable intervention in the dispute). Rains are seasonal if they occur at a certain time of the year; they are seasonable at any time if they save the crops.