Its so funny when console player are like OMG WE GET THIS, or OMG WE COULD GET THIS. When im playing FNV with it thanks too mods

. But yes it would be pretty cool. A mod called Navada skyes or somin that does that and its pretty good.
Since I love weather/rain in games so much, I can totally appreciate that console gamers may get excited about having it. Once I started using Nevada Skies, I set it to rain frequently. I don't care if it's illogical for the Mojave, I like the sound of rain, even in a video game. It's....soothing. Plus it makes it dark and moody. I like that. Based on the mods, it's definitely possible to have it randomly rain everywhere in the gameworld...what they've done in the DLC tho, who knows.
Lake Mead is for pansies, real women shower in the rain.
I'd prefer a massive waterfall, but rain will do in a pinch.