Quoted: The moon reaches its closest point to Earth every 27 days, Jennifer Stafford, an astronomy graduate student at the University of Wisconsin-Madison said in an interview last month. A full moon occurs every 29½ days.
What makes summer special for moon-gazing, Jim Lattis, director of UW-Madison Space Place said in an interview earlier this summer, is that full moons are lower in the sky. During the summer season, the sun is higher, and the moon is lower, making the moon especially picturesque.
It will appear biggest when it’s lower in the sky, near the horizon — just after rising, or just before setting — due to a scientific phenomenon called “the moon illusion.”