Slow it down, the water is very cold and the fish won't move very far for food, so you've got to get it right on them. Streamer fishing, or dead drifted weighted nymphs will be the best technique through the cold winter months. Try an indicator leader instead of a physical indicator on your line - it's one less thing to freeze up and you'll have a better feel for the flies and what they're doing anyways.
Increased chance and severity of wind and rain over the next 7-10 days. Expect some variability in flows and water temps and adjust accordingly. Springtime conditions!