It's 24 hours without the sun over the horizon - hardly 24 hours of darkness (even in December there are several hours of twilight - like a stretched out sunrise/sunset - but with the sun below the horizon - and often deep blue colors).

So maybe this was the inspiration for the color correction decisions on Ozarks! ;P

Hehe, just watching the last of season 4 - and yes, it's dark and blue - but no, it's not deep blue. With the sun under the horizon you get some variation on "magic hour" light - much warmer than what they aim for in (almost all of) Ozarks :)

Their latitude is not high enough.