Pre/post electricity ambient lighting.

[Papa Juliet Whiskey]

One thing I've noticed over the years, living within an urban area, is that overcast nights are brighter than a clear sky at night. And that during snowstorms, it's almost as bright as it is in the daytime(less the sun's glare reflecting off the snow on the ground). The wonderful byproduct of light pollution. 

 

I would love that to be replicated in game(not too common, but you can set the start month in winter without applying 6 months later), then have it disappear again once power is lost. I noticed in this thursdoid, that sound works is going to make some changes based on whether or not the power and water is running, so I imagine implementing different lighting effects shouldn't be to problematic, and would add a little more immersion.

 

It would also have the benefit of being less punishing getting cought out at night during early game. Allowing the player to find a lead on a flashlight.

[traindoc]

I think this will be likely addressed by the coming changes in Build 42 with dynamic lighting etc. Here's the video of that in action from this news post.