1. In accordance with the season
   "it was seasonably cold" 
2. At an opportune time
   - timely, well-timed, apropos

See also: seasonable

Antonym: unseasonably

• covering fire
• covering letter
• covering material
• coverlet
• covert
• covert operation
• covertly
• covertness
• coverture
• covet
• covetable
• coveted
• covetous
• covetously
• covetousness
• covey
• coville
• coving
• cow
• cow chip
• medical aid
• medical assistant
• medical bill
• medical building
• medical care