Accurate monthly search data

[UOEWebTeam]

I have a search term that is only used widely for one month of the year (roughly) - that keyword is "ucas clearing" only really used in august.

Looking at google's keyword tool it shows a monthly search figure of 22k and apparently this is the average across the year. Now, do google add up 0,0,0,0,0,0,0,264k,0,0,0,0 - divide by 12 and come up with 22k  - or do they see that it isn't steady traffic and just ignore the 0 months and therefore 22k is actually about right?

Many THanks for confirmation,

Ally