Every year, people count on cold winter temps to kill off all of the bugs. It’s true that some bugs will die during the winter from freezing temps, while other bugs will survive cold winters by making their ways indoors (into our homes), or by going underground, down below the frost line.
One such bug that immediately comes to mind, only because I deal with it so much, is the subterranean termite. Termites are active 24 hour a day, 7 days a week, 365 days a year. The only time that they are not active is when freezing temps roll in, at which point they travel down there mud tubes, down into the ground, and down below the frost line. As soon as the freezing temps pass, the termites will promptly make their way back into the structures, continuing their work.
Areas that have a more moderate climate will likely have higher insect populations. In Georgia, we normally have a good enough cold snap or two, that many bugs will die off. Some winters, such as this current one, are so mild, that not many bugs die off. It will definitely be interesting to see what happens once spring arrives!