I certainly agree that warming trends and warm rain inflow can change things dramatically, but when you live 10 minutes from the White River. I'm not going to trailer an hour on the hopes that a few bass may play. For my bass fishing, 40 surface means " wait a while".
Deep water crappie in wintering holes is a different story. In my old stomping grounds, there were several lakes that crappie fishing got very easy when the water got real cold.