It appears that it is an Eastern Screech Owl - they are very common here and lots of other places too:
The Eastern Screech-Owl is the most common owl in Houston. Very small (8" - 9"), it has two color morphs: gray and red, with gray being the most common. Screech-Owls mainly eat insects, but also like to hunt for small fish and frogs.Merry Christmas, Owl!
They are relatively tame and curious, and have been known to follow evening strollers out of curiosity. They readily accept an owl house. Screech-Owls are best seen in the early evening or pre-dawn hours. Their call is long, descending quavering whinny. A second call is a long, low trill.