Feel the Magic: December’s Cold Supermoon offers your last 2025 sky spectacle — but will bright moonlight block the Geminids?

The last supermoon of 2025 lights up the December sky this week. It peaks at 6:15 p.m. EST on December 4, giving stargazers one final chance to see a moon that looks bigger and brighter than usual. This Cold Moon will orbit roughly 221,965 miles from Earth, making it the third and final supermoon of the year.

The moon will also appear full on Wednesday and Friday nights, offering multiple opportunities to enjoy its glow. Clear skies will make it perfect for photographs or simply admiring the crisp winter evening sky. Even casual viewers will notice how bright and large it appears compared with a normal full moon.

A supermoon occurs when the moon’s orbit brings it closer to Earth than usual. At this distance, it can look up to 14% larger and 30% brighter than the faintest moon of the year. Because the moon’s orbit isn’t a perfect circle, its distance varies, creating these dramatic visual effects that make each supermoon unique.


When the moon rises near the horizon, it can appear enormous due to the moon illusion. Buildings, trees, or hills on the horizon trick the brain into seeing the moon as bigger than it really is. During a supermoon, this effect is even stronger, making the Cold Moon a stunning sight without any special equipment.

December’s full moon is called the Cold Moon because it marks the coldest nights of the year. Native American traditions also referred to it as the “long night moon,” reflecting the extended darkness of December evenings. Its brightness makes it visible even in urban areas with light pollution, offering a calm and mesmerizing spectacle for everyone.

Full illumination strikes at 8:20 a.m. EST on December 4. That's 6:20 p.m. PST for West Coast viewers. The moon reaches perigee 12 hours earlier. Perigee marks the closest approach to Earth.

This positions it as the year's second-largest full moon. Only October's supermoon edges it out slightly. Data from astronomers confirm 221,965 miles as the key metric. Such proximity amplifies size and glow dramatically.

Moonrise on December 5 offers the top view. The moon hugs the eastern horizon at dusk. This creates the classic "moon illusion" effect. Buildings and trees frame it for extra drama.

In New York City, moonrise hits 4:56 p.m. EST. Los Angeles sees it at 5:27 p.m. PST. Chicago times in at 5:22 p.m. CST. Atlanta rises at 5:30 p.m. EST. Each city gains from low horizon placement.

Weather apps predict clear conditions in the Midwest and Northeast. Clouds may hinder Pacific Northwest views. Patience pays off as the moon climbs higher.

Some observers may wonder if this bright moon will affect the Geminids meteor shower, which peaks around the same time. The intense glow of a supermoon can make it harder to see fainter meteors, but the brightest streaks will still be visible for dedicated skywatchers.

The Cold Moon sets the stage for Geminids. That meteor shower peaks December 13-14. By then, the moon wanes to a slim crescent. Faint moonlight won't wash out streaks.

Geminids deliver up to 120 meteors per hour. Dark skies from the post-supermoon phase help. Combine both events for a full week's cosmic show. US observers in rural areas score the best rates.

Full moons happen every 29 days, but calendar months can contain two full moons in rare cases. If you miss this last supermoon of 2025, there will be three more supermoons next year. Each will offer its own visual charm, depending on the season and the moon’s position in the sky.

When is the last supermoon of 2025 and how can you see it?

The last supermoon of 2025 is coming this week. This spectacular December moon, also known as the Cold Moon, reaches its brightest point at 6:15 p.m. EST on December 4. It’s the third and final supermoon of the year, giving skywatchers one last chance to enjoy a luminous night sky before 2026.

If the weather is clear, the moon will appear full on Wednesday and Friday nights as well. That means you don’t have to worry if you miss it on the main night—you’ll get multiple chances to admire its beauty.

A supermoon isn’t just a regular full moon. It looks bigger and brighter than usual, making it a perfect subject for photos. Even if you aren’t a photographer, just stepping outside to watch it can be a magical experience.

The moon will orbit about 221,965 miles from Earth, which is close enough for it to seem extra large and striking in the night sky. The upcoming Cold Moon is shaping up to be one of the most memorable celestial events of 2025.

With a little planning, you can make sure you catch this stunning natural phenomenon. Whether it’s in your backyard, at a park, or on a quiet street, the Cold Moon is ready to dazzle.

What makes a supermoon different from a regular moon?

A supermoon happens when the moon’s orbit brings it closer to Earth than usual. This makes the moon appear slightly bigger and much brighter than a normal full moon. In fact, a supermoon can appear up to 14% larger and 30% brighter than the faintest moon of the year.

Because the moon’s orbit isn’t a perfect circle, its distance from Earth changes. When it is closer, the moon looks bigger, giving us the dramatic supermoon effect. This is why some full moons are called supermoons and others are not.

Supermoons aren’t rare, but they are special. There are usually three to four supermoons each year, and December’s Cold Moon is the last for 2025. For many, it’s a chance to experience the night sky in a way that feels almost magical.

Even if you’ve seen a full moon before, a supermoon is noticeably different. The brightness and size make it stand out. It’s a reminder of the fascinating celestial mechanics that play out silently above us every night.

Observing a supermoon can also spark curiosity about astronomy. It’s a perfect time to notice how the moon’s light reflects on your surroundings or casts long shadows in the quiet night.

Why does the moon look so big when it rises?

Have you ever noticed the moon looking enormous when it’s near the horizon? This is called the moon illusion. When the moon rises behind buildings, trees, or hills, our brains perceive it as bigger than it really is.

The effect is more pronounced during a supermoon. The moon is physically closer to Earth, and that extra size makes it feel even more impressive. This is why photographers often wait for the moon to rise to capture dramatic images.

Watching the moon rise can be a mesmerizing experience. Its golden light, low on the horizon, contrasts with the dark silhouettes of the landscape. This makes the Cold Moon one of the most visually striking events in the night sky.

Even casual observers notice the difference. You don’t need a telescope to see that this moon looks unusually bright and large. Simply stepping outside and looking at the horizon can give you that awe-inspiring view.

The moon illusion reminds us that our perception of nature can sometimes be as fascinating as nature itself. Pair it with the supermoon, and you have a night that’s truly unforgettable.

Why is December’s full moon called the cold moon?

December’s full moon is known as the Cold Moon because it marks the arrival of the coldest nights of the year. The name comes from Native American traditions, which often linked moon names to seasonal changes.

Some tribes also called it the long night moon, reflecting the longer nights and shorter days of December. The moon’s presence during this time becomes a comforting and guiding light in the dark winter evenings.

The Cold Moon is a symbol of transition. It reminds us that the year is ending and that nature is preparing for winter. Watching it can feel calming and grounding, especially in the quiet of a crisp December night.

It’s not just a poetic name. The moon’s brightness and size during a supermoon make it easier to see in the long winter night. Even in urban areas with some light pollution, the Cold Moon can still look bright and beautiful.

For many people, the Cold Moon is more than just a celestial event—it’s a moment to pause, reflect, and appreciate the rhythms of the natural world.