It's because most forecasters like to go cold. Some do it because they know it gets clicks, like MSNBC Combo and Weather Indirect and @BigColdBiasBastardi. Others do it just because they have an underlying cold weenie bias. Forecasting winter temps for the SE would be very easy if you just went warmer to much warmer than normal every year. We are in a pattern, for whatever reason, where this part of the country just wants to be warm in the winter. It doesn't matter what winter forecasts say. It doesn't matter what the long range climate models say. It doesn't matter what the Almanacs say (any of them). It doesn't matter what the woolly worms say. And it doesn't matter how fat the chipskunks are or how fast the trakerjackers are flying. It is just going to be warm. And that's it.
Until it changes.