Fair weather fan?

Allison and I were discussing going to the football game this weekend. She asked about the weather.

J: It's mostly nice through Friday, don't know about Saturday.

A: If it's raining I don't want to go! I guess I'm more of a fair weather fan.

Pause.

J: You realize "fair weather fan" relates to how well a team is doing, not the temperature.

A: (laughing) Oh.