The full cold moon — the third and final of fall in the Northern Hemisphere — will turn full on Thursday, Dec. 4, 2025. Named for the chilly temperatures at this time of year in North America, this moon is not only the second-biggest full moon of 2025 — a “supermoon” — but it reaches higher into the sky than any other. It’s the third of four supermoons that round out 2025 and begin 2026.
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