I think it's safe to say that the Summer of 2009 will be remembered as cooler than normal. Even though temperatures in July and August were well below normal, the average for the entire Summer was not as impressive due to a couple of heat waves in June.
Much of the country saw below normal temperatures. A notable exception was Texas and the western states. Here's a link to an article from NOAA (National Oceanic and Atmospheric Administration). - Kent