Does room temperature affect your sound?

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

Electrical conductivity improves as temperature falls. Superconductors have to be frozen. As fall as sound production by speakers is concerned,  I would think altitude might cause a greater change in a speaker's characteristics than temperature as air becomes less dense and barometric pressure drops. If you go high enough you get no sound at all.

No, but humidity does.  And if you're running your heat non-stop, you're going to end up with very dry air.  Unless you have a humidifier hooked up to your HVAC.