There seems to be a definite difference between the start of the month and end of the month CTR for adsense on our main site. Last month for the last week of the month we were averaging double daily income compared to the previous 3 weeks of the month. This month, again for the last week the income has risen again. This time not due to a surge in visitors, as numbers have stayed pretty level, but CPC has doubled, and more in some places. And we're making around 50% extra than normal.nnThe page I'd rewritten during my Improving PPC Experiment yesterday had an average CPC of 350% over and above the original CPC before my experiment. Other channelled pages had higher average CPCs too.nnSo what does this mean? I'm still wondering if the idea of the fact it's the end of the month and so AdWords advertisers have got the rest of their budget to use up so they up their CPC could be true. Perhaps at the end of the month a new business decided to try out AdWords, comes onto the content network and then on the last day of the month realises it's possibly not beneficial to them and works out how to come off the content network and just stay on the Google search! Daft but you never know.nnHowever there's a been a definite difference this month, so come the 1st of August, I don't believe there are national holidays going on etc. So we'll see if there's a drop in CPC and subsequently income again.nnHowever the good news is we're on course for another $100+ in Dave's adsense which means another payment next month Now I just have to get him to put it into my account and stop keeping it!