Search volume in getKeywordVariations not changing over time?

[Rakesh]

I've used the getKeywordVariations operation in the KeywordToolService
to look at search volume for over a thousand keywords, for both
November and December.

The search volume for both months is identical. This strikes me as
odd. I'd guess that some keywords might have the same volume in both
month, but not all 1000+ .

Has anyone else noticed this? Is there any information that could help
explain this? Does this data get refreshed on the first of the month
or is there a lag?

Thanks,
Rakesh

[AdWords API Advisor]

Hello Rakesh,

My thinking would be that the data is refreshed around the first of
the month, but I don't have any specific knowledge about that process.
If you could pass along a handful of example keywords, the date on
which you performed each of the the getKeywordVariations() calls, and
the monthly search volume data returned on each specific date I'll see
whether anything's amiss and escalate as appropriate.

Cheers,
-Jeff Posnick, AdWords API Team