Harry Potter and the missing courtyard?

[Scott]

No: HPFGUIDX 6253

Ok here is a mystery for you...

"...The day before Harry's first Quidditch match the three of them 
were out in the freezing courtyard during break and she had conjured 
them up a bright blue fire that could be carried around in a jam 
jar.  There were standing there with their backs to it, getting warm, 
when Snape crossed the yard.  Harry noticed at once that Snape was 
limping..."

Harry Potter and the Sorcerer's Stone (US ed.) Chapter 11, page 181


Now the mystery is- Where is this courtyard, and why is this the only 
time we hear of it???

Ok I know it's not a big deal but I am really curious about this.  In 
all the artistic interpretations I've seen very few that have a 
courtyard.

So where is this place, and what happened to it in books 2,3, and 
4????

Now there's a mystery for you.

Scott