Having been in Florida at that time of year, and due to go next month (Jan), I agree with downin3green. In 1994 had an interseting time, Wx was forecast solid VFR back to FXE from DABS. On climb out entered fog at 800 feet. Within 10 mins the entire coast was fog bound to SUA, OK inland. Yes, I did get a WX brief just 10 mins before T/O, albit it was 3.00AM. When the cold air from the North hits the warm florida area, strange things can, and do, happen.