noun
season's tidings; seasonal letter
A letter or message that conveys the feeling of the current season, often including seasonal greetings or updates.
友人から季節の便りが届いた。
I received a seasonal letter from a friend.
秋の深まりを伝える季節の便りを書く。
I write a seasonal letter conveying the deepening of autumn.
Compound of 季節 (season) and 便り (news, tidings, letter).