I trust them more than a meteorological forecast. An excellent indicator that things are about to change is bird movement. When the robins and blue jays show up around here, you can bank on a temperature change in the near future. They are here. Sandhill cranes are another indicator but I haven't seen any yet. Some look at poplar and sweetgum coloration but that is really just an indicator that things have changed. What do you look for to signal temperature change?