The cooler water will get the walleyes to start grouping in tight schools near larger pools in the Susquehanna River system. As the water cools into the 50s and 40s more will pull into these wintering areas.
Early morning and late evening often are the best times to fish for walleye at this time of year as well as after dark depending on river clarity. I usually cast swimbaits as well as Rapala Husky Jerks around shoals and shoreline structures. Fish both style lures slowly and varies your retrieve sometimes pausing until you find the right cadence.