A fan of a sports team who only shows support when the team is doing well. During hard times they usually bandwagon other teams. They basically have no real loyalty to the team, but still manage to get better seats than you at the game. Strangely they mysteriously vanish at the first sign of trouble.

Certain people who only watch a sports team when said sports team is having a winning season.

People who only support sports teams when they are doing well ie when the "weather is fair." If their team is losing, they don't claim to be a fan, but when their team is winning, they are obnoxious to the highest degree.

A person who is not a dedicated fan of a sports team. They only watch a game if it peaks their interest.

In most cases fair weather fans are bandwagoners who join in on the hype of a team or sporting event. Examples of this are: The Superbowl, The World Series, and Playoffs in general.

In other cases fair weather fans are people who just watch the sport or certain games when 'the weather is right'(when they feel like it). These fans are not characterized as bandwagoners because they have been fans of the sport/team before the hype and or big game (ex. Superbowl).