Jesus Wasn't really Born in December

The most likely year that Jesus was born, is 6BC, probably in the
month of March. There was no year 0 (zero) recorded, so the 2nd
millennium celebration of the birth of Jesus should have been held in
March 1995. But considering that Nativity was not celebrated at all
for the first 300-or-so years, and that Christmas became widely
popular only in the 19th Century, it remains remarkable that the
birthday of Jesus Christ today is one of the biggest industries in the
world. A rather apt acknowledgement."

http://www.didyouknow.cd/xmas/Jesus.htm