Internet radio listening as a whole traditionally slows during the summer months (see our coverage of the July Webcast Metrics here), and Pandora's August numbers show they're not an exception. But their year-to-year growth remains a positive.
The webcaster says it streamed 1.16 billion aggregate "listener hours" for the month, a 70% increase from the 682 million it streamed in August of 2011 -- but actually down slightly from 1.2 billion in July (see RAIN here). Pandora also says it has 56.2 million "active listeners" (that is, the number of accounts that've signed in during the last 30 days) now, up 48% from August of last year (38 million), and but up only slightly over July's 55 million.
Finally, Pandora says its "share of total U.S. radio listening" is now up to 6.30%, an increase from 3.67% at the same time last year (and from 6.13% in July).