[[03]Garsino]

Did you even try to compile your script?

pawn Код:

forward RandomWeather();
public GlobalWeather()

You forward a public named "RandomWeather" but the public itself is named "GlobalWeather".

Also, there is no need for a global variable.

pawn Код:

public GlobalWeather()
{
    return SetWeather(random(20)); //This will set the weather to a random number which is held in the variable "Weather"
}