Can you swim outside in January?

I don't think so, it wouldn't be warm enough.

The pools were open when I was there from Oct to Nov and the pools are heated. Not sure about the Saunas.

Yes, but based on the weather, if it's 60 degrees out, obviously it won't be as pleasant getting. Also they had the saunas closed as of November when I went

Yes

The pools are heated. Yes