The Wasteland is a barren place. But no matter what you do there, you'll need to see. That's where this mod comes in. It adds lights and beams to all of the street lamps in Fallout 3. Check it out, it can add to your immersion.
This mod from Mechanical Pirate makes it so cripping the enemy has much more pronounced effects. See File Details for specifics.
These are the plugings for the URWLRain master file that will apply the weather in the DLC's.