That's why you have a sleeping bag!!!
Speed up time.
Day light time is actually very pretty in this mod, I usually sleep a lot for it to always be daylight. Unless I'm wearing the Seva suit with clear purple NightVision, then I don't care if it's dark outside.
Like I said... three whole in-game days. Nothing but rain, fog, and darkness.
ETA: Other than the perpetual night thing, I'm really liking this mod. Moreso than Fallout 3, anyhow - I only the see the desktop when I alt-tab or when I quite, instead of randomly, between bouts of crashing to the desktop.