Us Weekly: 15 Editor-Approved Wedding Guest Dresses for Late Summer Into Early Fall December is the first month of winter in the Northern Hemisphere and the first month of summer in the Southern Hemisphere. In Ancient Rome, as one of the four Agonalia, this day in honor of Sol Indiges was held on December 11, as was Septimontium. December, twelfth month of the Gregorian calendar.

Understanding the Context

Its name is derived from decem, Latin for “ten,” indicating its position in the early Roman calendar. This article was most recently revised and updated by Charly Rimsa. December is the twelfth and last month in the Gregorian calendar and has 31 days. The December solstice on December 21 or 22 marks the beginning of winter in the Northern Hemisphere.

Key Insights

From Boxing Day to Yule, the month of December includes several cultural and religious holidays from around the world. The Month of December 2025: holidays, folklore, fun facts, gardening, recipes, and more from The Old Farmer's Almanac. The full moon in December is known as the cold moon, a name derived from the Mohawk nation, whose traditional territory straddles the U.S.-Canada border. 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.

Final Thoughts