Does room temperature affect your sound?

I don’t know about  temp.
But I think , humidity changes the dispersion of certain frequencies.

That would make sense, it's probably part of what I am experiencing.

With the unusual cold for your area there is probably increased demand for electricity which could result in lower current which will affect your stereo system. I live in Maine and we are currently in the midst of a cold spell and the current coming in has been as low as 112 volts versus an average of 115 to 116 which still isn’t ideal. I do notice the difference in the sound quality of my system when there are peak demands on the grid. 

Most of you guys are really helpful. Much appreciated. I have a voltmeter and will check it out.

Well OP, I go outside flip up a hoodie and come back in.. Stereo sounds BAD.. Flip the hoody back, take my hat off. Perfect. I forget sometimes.

The voltage thing is interesting, I never though about that in the winter. I guess folks do heat homes with electricity. I use valve amps and have for 30 years. I just have an old fashion floor heater that is Natural gas fired.
It stays at 60-62.

I keep the humidity high enough to stop static snap, but no problems with finishes in the house. Humidity stays the same here.

I guess were talking air density, sound flying through fog sure sounds bad.. Happened in SF a couple of times.. The fog would roll in an just ruin a concert, muffle the heck out of the sound in open stadiums, or Amphitheaters.

Regards