Fog color at night

[I can has fun?]

I love the fog, but there is one problem with it. Fairly minor, but hopefully easy to fix.

At night, the fog color is white. This makes night look like day. The shadows are all wrong, and I literally have more light coming off my LCD than during the day.

Is there any chance we could get the night time fog color changed to a dark gray?

[MrGrendel]

If there is any light in the area, such as a full moon, no clouds, or maybe torches, it might make sense that fog actually brightens the night a little. (Even while it still reduces visibility.) It refracts light, after all. Haven't really paid attention to it, though, so I can't say if it's a little much or what.