The Family Guy was referring to the fabric. Epic is not that waterproof having a waterhead of about 800mm, about 50% less that the 1.1oz silnylon. I have had all night rain on my Lighthouse and stayed dry but it in a few occasions it has wetted out and started to drip (not mist) after only a few hours.
Not sure if the temperature makes any difference because at times it held rather heavy rain.
It does dry very quickly and breathes well , at least for me using it as a solo tent...
Franco