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December Supermoon: Last full moon of the year - best time, place and how to watch

The last supermoon of 2025 is on Dec. 4, with the Cold Moon glowing brighter and larger as it nears the perigee, just 221,965 miles from Earth. This phenomenon marks the third and final supermoon of the year, linked to winters return and once called the long night moon. It reaches the maximum illumination at 6:15 p.m. EST but will seem full for several nights. NASA notes, Different publications use slightly different thresholds for deciding when a full moon is close enough to the Earth to qualify as a supermoon.