Two things are worthy of note. The first is that the Sun gets close to his Ascendant at the beginning of the month and crosses it during the first full week. That's more like a birthday celebration than anything else, and it's the best possible time because the Sun likes the first house of self.
Sales go through the roof.
The other thing is that Capricorn will start late this month. Once again, that's good for the King. There's a troublesome round with Mars, when the Warrior Planet sidles up to the King's Pisces Moon. This stirs up a little trouble, but it will last for only the briefest amount of time. Other than that little spot of turbulence, December is an enjoyable month for Elvis.