Stargazing Alert: December’s Brightest Moon

The final month of 2025 closes with a spectacular celestial event: the Cold Supermoon. Named traditionally for the deepening chill of early winter, this full moon is particularly notable because it will be the last supermoon of the year and the highest-rising full moon observed throughout 2025. This dazzling sight marks a luminous send-off for the astronomical calendar.

What makes this event so unique is its classification as a Supermoon. This occurs when the moon reaches its fullest phase while simultaneously being near perigee, the point in its orbit where it swings closest to Earth. Due to this proximity, the moon will appear slightly larger and shine significantly brighter than a typical full moon, creating a powerful glow across the night sky.

The peak illumination is scheduled for Thursday, December 4th, 2025, shortly after 6:00 PM Eastern Time. While that evening provides the primary viewing opportunity, the moon will also appear full on the preceding and following nights, offering flexibility for observers. For the most dramatic visual experience, plan to look toward the horizon during moonrise, and remember to bundle up to enjoy the last major astronomical show of the year.