Main entry: unseasonable
Definition: not in keeping with (and usually undesirable for) the season
Usage: a sudden unseasonable blizzard; unseasonable bright blue weather in November
Antonyms: seasonable
Definition: in keeping with the season
Main entry: ill-timed, unseasonable, untimely, wrong
Definition: badly timed
Usage: an ill-timed intervention; you think my intrusion unseasonable; an untimely remark; it was the wrong moment for a joke
Antonyms: opportune
Definition: suitable or at a time that is suitable or advantageous especially for a particular purpose