When the bell struck one the first ghost appeared.
 
The reader must understand who the characters are or who they used to be. For example in this case it would be Scrooge and Marley. It would also be how the character's felt about each other.
 
It is normally cold, foggy, and not so bleak.
 
When his nephew greeted him he said "BAH HUMBUG".
 
Marley was the who that came into Scrooge's room door.
 
It was cold, bleak biting, foggy weather. It shows that it is cold and foggy and not so good weather to be in at this time.