December 2025's Cold Moon: The Final Supermoon of the Year

On December 4, 2025, skywatchers will witness the last supermoon of the year, known as the Cold Moon. This full moon will reach its peak illumination at 6:14 PM EST, appearing particularly striking just after moonrise, around 3:54 PM EST in New York and 4:22 PM PST in Los Angeles. The Cold Moon is notable for being the third supermoon in a series occurring in 2025, following the Harvest Moon in September and the Beaver Moon in November.

Don’t Miss the Cold Moon – Here’s When to See the Last Supermoon of the YearWIONNewsweekUSA TodayBoston GlobeAssociated Press

A supermoon occurs when a full moon coincides with the moon's closest approach to Earth, known as perigee. During this event, the moon can appear up to 14% larger and 30% brighter than a typical full moon. Although "supermoon" is not an official astronomical term, it has gained popularity and is commonly defined as a full moon that comes within 90% of perigee. The Cold Moon, with its proximity to Earth, will exhibit these enhanced visual characteristics, making it a significant event for observers.

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To fully appreciate the Cold Moon, it is recommended to find a viewing location away from city lights, as light pollution can diminish the moon's brilliance. The best viewing times will be during moonrise and just before sunset, when the moon appears larger due to the optical illusion known as the "moon illusion." Stargazers may also use binoculars or telescopes for a closer look at the lunar surface, although the moon's full glow should be visible to the naked eye.

Don’t Miss the Cold Moon – Here’s When to See the Last Supermoon of the YearNewsweekWIONUSA TodayAssociated PressBoston Globe

The Cold Moon's proximity to Earth will also slightly enhance its gravitational pull, resulting in higher tides. In Boston, for example, tides may reach around 12 feet during this period. However, significant coastal flooding is not expected, even with a potential nor’easter approaching the area. Traditionally, the Cold Moon signifies the onset of winter's longest nights, and its name is derived from the frigid conditions associated with this time of year.

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Following the Cold Moon, skywatchers can look forward to additional lunar events in 2026, including the Wolf Moon on January 3. December will also feature the Geminid meteor shower, peaking on December 13 and 14, providing further opportunities for celestial observation.

Don’t Miss the Cold Moon – Here’s When to See the Last Supermoon of the Year

The Cold Moon on December 4, 2025, presents a unique opportunity for skywatchers to experience the last supermoon of the year. With its enhanced brightness and size, it promises to be a memorable sight, especially when viewed just after moonrise. Observers are encouraged to take advantage of this event, as it combines both scientific interest and seasonal significance.

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