Yep, it's winter.

[shwareefer]

And my skimmer draws from outside, lol.

 

[Scorpius]

Never have had any problems with outside air to my skimmer. Supposed to be -10 this Tuesday night.

 

[CollectOyster04]

If anything with cold air being more dense, technically you'd be getting more oxygen being sucked into the skimmer lol.