seasonably

from WordNet (r) 3.0 (2006)

seasonably
    adv 1: in accordance with the season; "it was seasonably cold"
           [ant: {unseasonably}]
    2: at an opportune time; "your letter arrived apropos" [syn:
       {seasonably}, {timely}, {well-timed}, {apropos}]

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]

         Mercy is seasonable in the time of affliction.
                                                  --Ecclus.
                                                  xxxv. 20.
   [1913 Webster] -- {Sea"son*a*ble*ness}, n. --
   {Sea"son*a*bly}, adv.
   [1913 Webster]