Wow! We won't have our first frost until sometime in December or January ... if we have one. The last two winters were extremely cold here in Florida. We had numerous freezes and many nights with temp's in the 20's!! I sure hope it doesn't get that cold this winter! I'm sure the Hummer is okay ... this is the time of year where they begin heading south ... your little one may have just been lagging behind a bit and fueling up for the journey.