On Mar 2, 8:12 am, Mxsmanic wrote:
Don Poitras writes:
If it's dark enough that you can't see much outside, then it _is_ IMC.

Nighttime isn't a meteorological condition. That's why you don't see
nighttime indicators in METARs. The key point is that you don't see much,
which allows you to fly IFR. I suppose that if you look out the window you
might see something, but you have to look, whereas during the day, the scenery
outside is hard to ignore.

--
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You can see just fine at night. In fact, you can see better, depending
on what you are looking for. Compare it to driving. Would you compare
driving at night to the equivalent of a thick fog?