seasonably

adverb4

1. •
   In a manner appropriate to the season.

   • The weather has become seasonably cooler lately.
2. •
   In due season; at an opportune or fitting time.

   • […] I suppose we may now seasonably proceed to consider the Style of the Scripture: A Subject that will as well require as deserve some Time and much Attention; […] — 1663
3. •
   Within the appropriate time period during which an action will be legally effective, as prescribed in legislation, a contract, or otherwise.

   • An action is taken "seasonably" when it is taken at or within the time agreed or if no time is agreed at or within a reasonable time. — 2005
4. •
   Varying with the season.