Sqrl on 13 March 2008
@OP,
I think you short changed the "holidays" a bit. Sales actually increase early in November (sometimes towards the end of October even) and tend to peak around Black Friday (at least in the US), then they stay high all the way through December of course (and the first week of Jan is pretty big usually as well). Some of the November holiday sales weeks are responsible for some of the biggest sales numbers seen every year so you really should try to factor this into your prediction.
Since you're making a prediction for the month and not the exact week or day it might not move your prediction, but it doesn't hurt to be thorough~
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