The last supermoon of 2025: when to catch a glimpse

As the year winds down, many reflect on achievements and challenges alike. There's no better celestial moment for such contemplation than the last full moon of 2025, which promises a spectacular display in December.

This month's moon will appear unusually large and luminous, qualifying as a supermoon. According to Space.com, it will reach its peak on Thursday, December 4. NASA defines a supermoon as a full Moon occurring near its closest approach to Earth, known as perigee. Though not an official astronomical term, it typically refers to a full Moon within 90% of its nearest point to Earth.

Supermoons are relatively rare, occurring only three to four times a year. In 2025, previous supermoons appeared in October and November. During these events, the Moon can appear up to 14% larger and 30% brighter than the year's smallest full moons.

December's Cold Supermoon Details

The December full supermoon, also called the Cold Moon, will reach maximum brightness at 5:14 p.m. CT, according to the Farmer's Almanac. Stargazers are encouraged to look at the Moon around this time, especially near the horizon, to experience the "Moon illusion," which makes it appear larger.

Temperatures may drop as a cold front moves through South Central Texas the night before, so warm clothing is recommended. NASA reports that while the Moon can be as far as 252,088 miles from Earth, this supermoon will be just 221,813 miles away.

Visibility in Texas

The National Weather Service predicts cloudy skies in the San Antonio area on the evening of the supermoon. However, in locations with clear skies, viewing should be excellent. Observers should seek dark areas away from city lights for optimal visibility.

The Name and Significance

The Farmer's Almanac names this lunar event the Cold Supermoon due to the season's low temperatures. It is also sometimes called the Long Night Moon because it rises during the longest nights of the year, around the winter solstice, and remains visible for an extended time.

Author: Gavin Porter