Final Supermoon of 2025 to Illuminate December Skies
The last supermoon of 2025, known as the Cold Moon, will be visible on December 4, appearing larger and brighter as it reaches its closest point to Earth.
The final supermoon of 2025, referred to as the Cold Moon, is set to brighten the night sky on Thursday, December 4. This event marks the third consecutive supermoon of the year, occurring when the full moon coincides with its closest approach to Earth, known as perigee. During this time, the moon can appear up to 14% larger and 30% brighter than when it is at its farthest point, or apogee.
The Cold Moon will reach its fullest phase at 8:20 a.m. EST on December 4. While this exact moment may not be visible in North America due to daylight, the moon will appear full on the nights of December 3 and 4. For optimal viewing, observers are encouraged to watch the moonrise on the evening of December 4, when it will ascend the eastern horizon shortly after sunset.
This supermoon is also notable for its high trajectory across the sky. As the full moon rises opposite the sun, and with the winter solstice approaching on December 21, the sun is at its lowest point in the sky, causing the full moon to climb exceptionally high.
No special equipment is required to view the supermoon; it can be observed with the naked eye, provided the skies are clear. However, the visual difference may be subtle to some observers.
In addition to its visual appeal, the supermoon may cause slightly higher tides due to the moon's increased gravitational pull when it is closer to Earth. However, these changes are generally minimal and not easily noticeable.
Skywatchers are encouraged to find an open area with an unobstructed view of the eastern horizon to fully appreciate this celestial event.