I am seeing a variation in my eCPM by a factor of three. If I look at a month I can see variation where my high days are three to four times my low days. I get thousands of impressions so this is not a case of low impressions bouncing the eCPM way up. What are your experiences? How much better are your highest days than your lowest?
My largest website in my AdSense account (roughly 10,000 impressions daily), has it's eCPM vary by around 60% (up from the lowest value - hope I'm making sense ).
This month my best day brought in 2.5 x more than my worst -funnily enough they were consecutive days. This sort of variation is typical.
I believe that the greater the number of pageviews the less the variation but it is still interesting to see 10,000 pageviews can have a 60% variation. I had close to a 4x difference between worst and best days in January which occured on consecutive days. Thanks for the feedback.