I don't know what the stats are but I know that for my site income slows a bit from late September till mid November. Then from mid November through the entire month of December my income is always very good. Then it slows down a lot for January and February which it did this year. However since Feb 1st the income has been horribly low, like record low earnings. My income from AdSense for January 2012 was almost exactly what it was in January 2011 and 2010. It has gone up very slightly each year, but same as expected. However my income from February 1st and 2nd of 2012 is 35% lower than it was from February 1st and 2nd of 2011. And today, Feb 3rd is looking just as bad. What I am trying to say is that my income is usually lower in February, which is already bad but I am usually prepared. However when it gets even lower than the "slow" month I was expecting, we have a problem. Traffic hasn't changed a whole lot, maybe down just a little but not enough to justify 35% income drop.
Extremely terrible January for me for Adsense, the ads that are showing up are just really low CPC value... One of my sites has its clicks soar, traffic stats are up, CPC are up on one site, but earnings at its lowest since October of last year... My new domain (but old site) suffered tremendously with low CPC and strange number of clicks invalidated in January. Hope things pick up.
Since December 19th adsense is killing me.January was the terrible and February the same thing.I really hope on March Goglee improve my CPC
competition is getting harder, CPC is getting lower, traffic is decreasing... might be time to find another income source, question is what?