2025年12月4日的冷超级月亮将在日落后最易观测，为2025年的最后一个满月，同时是连续第三个超级月亮。此时月球距地约357,000 km，比一般满月亮度高约16%，视直径可增至约8%，并在近地点后约12小时达到百分之百照明。其轨道距离范围约在近地点380,000 km与远地点约407,000 km之间，使其成为全年第二近的满月。

2025年12月的满月为当年第12次，也是全年高度最高者。由于冬至将于12月21日到来，太阳位于最低点，使满月处于全年最高位置。该满月发生于冬至前17天，因此并非最接近冬至的满月；2026年1月3日的满月发生于冬至后12天，将成为第四个亦是最后一个连续超级月亮。

精确满月时刻为2025年12月4日18:14 ET。满月前后一晚皆可能呈现近乎满月，但月出时最易出现无科学定论的「月亮错觉」。若天气允许，于东方地平线具开阔视野的高处即可观测本年度最后的月象。

The Cold Supermoon of December 4, 2025 appears shortly after sunset and is the final full moon of the year, as well as the third consecutive supermoon. At roughly 357,000 km from Earth, it ranks as the year’s second-closest full moon, reaching full illumination about 12 hours after perigee. Its elliptic orbital range spans roughly 380,000 km at perigee to about 407,000 km at apogee, producing up to an 8 percent apparent size increase and about 16 percent greater brightness.

December’s full moon is the twelfth and the highest of 2025. Approaching the December 21 solstice, the Sun reaches its lowest altitude, placing the full moon at its highest. Occurring 17 days before the solstice, this cold supermoon is not the closest full moon to that date; the January 3, 2026 full moon, only 12 days after the solstice, will be the fourth and final consecutive supermoon.

The exact full moon moment falls at 6:14 pm ET on December 4, 2025. Although it appears nearly full the nights before and after, moonrise offers the strongest lunar illusion, whose mechanism remains unexplained. With clear weather and an unobstructed eastern horizon, an elevated site enables observation of the year’s final lunar display.