Track them down even when the water is cold.
When I think of fishing for catfish, I normally wait until the water is nice and warm. The fish seem to be more active and easier to locate. Fishing for them in winter when the fish are lethargic and cold takes skill, though. Here's how to find fish when the water is cold.
The biggest thing to remember is when the water is cold, the fish won't move, so you have to. While in this process, use your electronics to find bait fish.
Also, drop-offs are a killer location this time of year. If you can find a location where moving water is dumping into any warm spot in the lake, set up there.