Summer is not really the most popular time for birding in East Texas. There are likely two reasons for that.
First and not surprisingly, East Texas summers are HOT. That definitely affects us birders. It really is not quite as much fun to get out in the woods when the temperature is in the 90's and the humidity close to the steam setting.
The second factor is due to the birds themselves. By the time that the summer heat arrives, the Spring migrators have mostly gone further north, leaving just the local species - the ones that we are mostly used to seeing. Of course, they aren't crazy about the heat either.