pertaining to, dependent on, or accompanying the seasons of the year or some particular season; periodical: seasonal work.
a seasonal product, employee, etc.: to hire seasonals.

1830–40; season + -al1

seasonally, adverb
seasonalness, noun
multiseasonal, adjective
nonseasonal, adjective
nonseasonally, adverb
preseasonal, adjective
transseasonal, adjective

seasonable, seasonal (see usage note at the current entry).

Seasonal and seasonable are sometimes interchanged, probably because of their obvious connection with season. In edited prose and in formal speech these two adjectives are almost always distinguished. Seasonal describes phenomena that occur with or depend upon a season or the seasons: seasonal fluctuations in rainfall; seasonal sales. Seasonable in reference to weather means “suitable to or characteristic of the season”: a seasonable December; seasonable temperatures for July. Seasonable also has the sense “timely, opportune”: a seasonable offer of financial assistance. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seasonal (ˈsiːzənəl)
of, relating to, or occurring at a certain season or certain seasons of the year: seasonal labour

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
We've heard the tired knocks against us, that we're snobs, smugly celebrating
  our seasonal supremacy.
Saguaros crowd the slopes and huge boulders fill the canyon bottom, where a
  seasonal stream runs.
Such oscillatory dynamics are only too familiar to us, for example, in the
  seasonal fluctuations of influenza cases.
Glacial melt and the seasonal rains, the key suppliers of water, are already
  affected by climate change.
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