We are having abnornally cold weather. Hard freeze last night and the next 3 nights. Daytime high today did not break 32. Tomorrow will be a little better, mid 30s, and Christmas Day, lower 40s. We have a couple of Rufous Hummingbirds feeding in the yard. They first tried the Salvia coccinea but it is not too heavy with blooms right now, so they went for the feeder, which was frozen solid. I put out fresh food, and will bring it in before sunset. My question: Is it ever too cold for the birds to feed on the liquid in the feeders? I would think the little fellows/gals would get hypothermic pretty quickly...although they might warm up quickly the way they move around.