seasonal friend

Person who is best friends with you only during a sport or time of the year that you spend together. Usually very fake and over-friendly.

seasonal friend: a person who only comes around during a certain season or multiple seasons

A friend who seems to always want to do something during one season (summer, for example), then seems to drop off the face of the earth once the other season rolls around for one reason or another (perhaps school).

One way to mitigate this type of friend is to share in common interests during more than just the months where they seem to have the most time.

A Sport-season friend is somewhat like a fair-weather friend, except you're only friends with them during/because of a certain sport season. They mostly come in the form of teammates, coaches, or fans. Sport-season friends are usually people that you would not have otherwise gotten to know, so integrating them into your primary group of friends is often difficult. While the friendship occasionally extends into other parts of the year, it is at its strongest during the sports season. They are very prominent among high school athletes--especially when there are age/social rank differences.

an acquaintance whom you see only about four times a year, typically every three calendar months, even though you generally get along jovially. The lack of more frequent camaraderie can be due to geographic distance, a lack of deeper connection, or as is most often the case - the passage of time in what was once a closer friendship