A seasonal factor, event, or change occurs during one particular time of the year. Seasonal variations need to be taken into account. + seasonally sea·son·al·ly The seasonally adjusted unemployment figures show a rise of twelve-hundred. happening, expected, or needed during a particular season
occurring at or dependent on a particular season; "seasonal labor"; "a seasonal rise in unemployment
occurring at or dependent on a particular season; "seasonal labor"; "a seasonal rise in unemployment"
people not working due to regular fluctuations in demand, e g ,crop harvesters are only in demand for part of the year, and demand for construction work diminishes greatly in winter climates