Seasonal

Adjective

 * Of, related to, or reliant on a season or period of the year, especially with regard to weather characteristics.
 * It is a seasonal swimming pool.

Antonyms

 * unseasonal

Derived terms

 * seasonal affective disorder

Thesaurus
aestival, alternate, arctic, autumn, autumnal, beating, boreal, brumal, canicular, circling, cyclic, epochal, equinoctial, even, every other, hibernal, hiemal, intermittent, isochronal, measured, metronomic, midsummer, midwinter, oscillatory, out of season, periodical, pulsing, reciprocal, recurrent, recurring, rhythmic, rotary, serial, solstitial, spring, springlike, steady, summer, summerlike, summerly, summery, undulant, undulatory, vernal, wavelike, wheeling, winter, winterlike, wintery, wintry

Translations

 * Finnish: kausiluonteinen, sesonki-, kausittainen