noun, plural sea·son·al·i·ties.
Examples from the Web for seasonality
Alan Tita, et al. “Seasonality in Conception of Births and Influence on Late Initiation of Prenatal Care.”It's High Time for Conception: Studies Show Peak Times, Weather for Sex|Anneli Rufus|December 27, 2011|DAILY BEAST
He does everything in a genuine authentic Italian style with a fantastic touch for seasonality.
This recipe is seriously simple, and will impress not only with its beauty but with its seasonality, too.