We've been told that Houston and the surrounding area has its own micro-climate. Similar to cape cod. We have been experiencing some intense thunderstorms. Yesterday was a nice day until the afternoon when the rains came. Silly us, we never closed the cover to our fan, so we came home from running errands to a big soaked area of our teardrop mattress! Fortunately, the mattress cover is a marine grade waterproof material. The sheets, however, were really wet and while we were trying to soak up the wetness, it was still pouring. Thankfully we have the tent set up over the picnic table, but with blowing winds we weren't too dry! Lesson learned: always close the fan cover before leaving the campsite.