What Number of Month is December

December month number is 12 and it is the twelfth month of the year.

December is the twelfth and last month of the Gregorian calendar, with 31 days. The name "December" comes from the Latin word "decem", which means "ten", as it was originally the tenth month in the Roman calendar. The ancient Roman Calendar had only ten months and began in March. During the reign of King Numa Pompilius (circa 713 BC), the Roman calendar underwent some revisions which included the addition of two new months, namely January and February. In 153 BCE, it was officially declared that January 1 would be recognized as the first day of the year, causing December to be designated as the twelfth month.

December is known for being the month of many celebrations and holidays, including Christmas and Hanukkah. It is also the first month of winter, which at the northern hemisphere starts around December 21, the day of the southern solstice, also known as december solstice or winter solstice.