Drop in adsense revenue

I'm very satisfied with Google Adsense, but around the 13th or 14th of October my revenue dropped even though I still have the same number of daily pageviews and clicks.

Has anyone else experienced the same?

Is this just temporary (for instance because the advertisers don't pay as much per click this time of year) or will it be a permanent drop in revenue because Google keeps a larger share?

It will fluctuate dependent upon AdWords bidding and the ads chosen by Google to display on your pages. You will find your revenue dependent upon this and your traffic levels.

Thank you for your quick response.

I know that the revenue will fluctuate dependent upon AdWords bidding and the ads chosen by Google to display. But has anyone experienced the same decrease in revenue on those specific dates?

I do wish they stated their cut but I don't remember anything happening on those dates. Sometimes bidders are simply overbidding and they get smart or run out of money. Or a multitude of other things could have happened. Not much to do but wait for another bidding war to erupt. ;-)

I guess you're right. I'll continue to improve my sites and their rankings and then I hope for another bidding war:-)

I just think it's odd because I have the ads placed on several different websites. That should minimize the risk.

The drop began (for my websites) on 24th of october.
And they are still dropping...
Revenues have dropped 40% since then.
Impressions have dropped only 10%

One advertiser in the lower portion of the bidding pyramid might have reduced his bid or stopped bidding. The result of this can be a collapse of bid levels all up the chain.

Or, maybe another webmaster in your theme started running adsense and now there is an enormous increase in available ad space with resulting decrease in price.

Many other factors could be at play. You might have triggered this yourself by changing page content and thus now drawing different ads.

Some very good points. Thank you!

Though I haven't changed the content on the affected pages, so there's probably not much I can do to fix the problem.

That's about ten days after I experienced the drop. So there's probably no connection. If Google had changed the split it would have affected all webmasters using Adsense and that don't seems to be the case.

Let my tell all the details...
All my sites (20 aprox.) are in spanish.
I changed the google account in september, but it worked well during 20 days after the change. It was on october, monday 24 when the drop happened.
I have reached the same impressions, about 20000, but cannot improve the revenues.
How are you doing now?

Have all your 20 sites dropped? Or have some dropped more than others?

I have a large number of sites too, but it's mainly my two major sites that have dropped.

One thing that no one has mentioned yet is that Google added a new feature to AdWords this month that allows you to post different bids for Content Network ads than Search Network ads. It's a checkbox on the Campaign settings page, but I haven't checked it so I don't really know much about it's features; but it sounds pretty straight-forward. I knew that once the word came out AdSense revenue would take a hit. With your sites being in Spanish, it's possible that the update to AdWords that I mentioned rolled out ahead of time for these sites (if they originate from another country other than the U.S.) and they have had more time to start adjusting their campaigns than those of us in the U.S. have.

My most significative site has 10000 impressions.
It dropped the CTR from 15% to 8%
I don't think that content network can vary the results in one day... or... did google apply the change on those days for all adwords advertisers?
There is no change in content, we update the info every day but it's very similar from one day to another.