This post highlighting the ability to quickly view performance by month in the new AdSense Interface.
Previously, the easiest way to view all account data by month was to export all reports to CSV, then post-process the data in a spreadsheet. Now you can get the same data with just two clicks without leaving your account. On the Performance reports tab, first click on 'More reports,' and then 'Entire account by month.' From here you can see a graph of your earnings. Immediately below the graph, you'll see data for your account by month.
Give it a try today! Navigate to the new interface and click on the Performance reports tab, 'More reports,' and then 'Entire account by month.'