seasonable

Short definition from Wiktionary

Adjective

1. 1
   Opportune; occurring at an appropriate or suitable time.
2. 2
   Appropriate to the current season of the year.
3. 3
   Ephemeral; lasting for just one season.
4. 4
   In season (said of game when it is legal to be hunted and killed).
5. 5
   Well-seasoned; matured (e.g. timber).