We cruised out of Houston last January..It was cool and raining....The ship was about 8 hours late in getting into port because of heavy fog.
But it still turned into a very nice cruise...
I live in Houston and the weather is unpredictable except during the summer. Summer of course is HOT and very humid. December can be beautiful, shorts and t-shirt weather or it can get chilly, rainy and gloomy. Never know.