National ding-a-ling day.National short person day.December is the 12th month of the year and has 31 days.This month is jam-packed with many need-to-know fun facts and here are our top 20.December is the 12th and final month of the year in the julian and gregorian calendars.Its length is 31 days.In recent decades, the number of warm temperature records in december has outpaced cold …