December Temperature New Smyrna Beach Municipal Airport (37 miles) 21 November December Lowest 4 February, 21 338 °F;Tomorrow Dec 10 78° / 66° 9 18 mph;In December, in New Smyrna Beach, Florida, the rain falls for 8 days The first month of the winter, December, is also an agreeable month in New Smyrna Beach, Florida, with average temperature ranging between min 594°F (152°C) and max 714°F (219°C) New Smyrna Beach Archives Florida Insider New smyrna beach fl average temperatures