noun, plural sea·son·al·i·ties.

the state or quality of being seasonal or dependent on the seasons: the seasonality of Halloween costumes.
Usually seasonalities. a pattern, variation, or fluctuation that is correlated with a season, day of the week, or other period of time: a study of birth seasonalities; You get higher returns in January because of seasonalities in stock prices. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for seasonality

Contemporary Examples of seasonality

  • Alan Tita, et al. “Seasonality in Conception of Births and Influence on Late Initiation of Prenatal Care.”

  • He does everything in a genuine authentic Italian style with a fantastic touch for seasonality.

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    Fresh Picks

    Eli Kirshtein

    February 23, 2010

  • This recipe is seriously simple, and will impress not only with its beauty but with its seasonality, too.

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    What to Eat

    September 1, 2009