Source : Webster's Revised Unabridged Dictionary (1913)

Seasonable \Sea"son*a*ble\, a.
   Occurring in good time, in due season, or in proper time for
   the purpose; suitable to the season; opportune; timely; as, a
   seasonable supply of rain.

         Mercy is seasonable in the time of affliction.
                                                  --Ecclus.
                                                  xxxv. 20.
   -- {Sea"son*a*ble*ness}, n. -- {Sea"son*a*bly}, adv.

Source : WordNet®

seasonable
     adj 1: in keeping with the season; "a hard but seasonable frost";
            "seasonable clothes" [ant: {unseasonable}]
     2: done or happening at the appropriate or proper time; "a
        timely warning"; "with timely treatment the patient has a
        good chance of recovery"; "a seasonable time for
        discussion"; "the book's publication was well timed" [syn:
         {timely}, {well-timed(a)}, {well timed(p)}]