Most months have one Full Moon, not two.
However, since the Moon’s period of phases is 29 ½ days, while months usually have 30 or 31 days, it’s obvious that if a full Moon lands on the first day of any month except February it will repeat again at the end.
Ever heard the expression, “Once in a Blue Moon?” Turns out, Blue Moons happen every 30 months on average. Two and a half years.
Also known as the Full Long Nights Moon. During December the cold of winter settles in and nights become longer and darker. This moon is also sometimes called the Moon before Yule. The term Long Night Moon is a doubly appropriate name because the midwinter night is indeed long, and because the Moon is above the horizon for a long time. The midwinter full Moon has a high trajectory across the sky because it is opposite a low Sun.