Asunto: Supporters...

Hi people.. I have a question maybe you can answer me..

When it rains.. how much % of people doesn’t assist to the match because of that?

50% ?

Attendance is affected by several factors -

1) Roofing - all things equal, this gives you the most attendance. Roofing ignores all weather, making attendance as optimal as perfect weather, every time.
2) If not covered, weather plays by far the largest role.
3) What kind of seating? people won't pay seating prices for benches, and even less for terraces.
4) Your pricing - price too high fans won't attend. You could have your sideline prices correct but the rest of the seating wrong, and attendance will demonstrate this.
5) How happy are your supporters? (reference this from your office page)
6) How happy are the fans of your opponent? (less away fans will travel if they are unhappy with the club)
7) Last and actually the smallest factor: Good ol' RNG. It plays a small role, not enough to worry about, but I've seen enough evidence in my two seasons here that it's there.

Oh, and generically speaking, 40-50% is probably a good guess all things being equal, but this can still be both positively and negatively mitigated by the other listed factors.

If your clubs not good enough for your fans to come out dressed in trash bags... and dive into pools of mud after the game in celebration...
What does it matter.. who needs fair weather fans anyhow! lol