We know that February is the shortest month, so it does not always get a full moon.
There is a full moon every 29.5 days, which is called the lunar calendar or lunar month. February is the only month that is shorter than a lunar month (lunation).
As a result, it's possible that February won't see a full moon as the years go on. In fact, there is no Full Moon in February about once every 19 years.
This is described as a "Black Moon" rather than a "Snow Moon".
Since February is the only month that is shorter than a lunar month, this can only happen during this month.
In the situation of Black Moon, January and March both get two Full Moons—also known as double Blue Moons.
A snow moon can only happen in February. If there isn't a full moon in February, the moon is referred to as a Black Moon.
It happens around every 19 years, with the most recent one occurring in 2018.
Hence, finally, the Full moon in February is known as a "Snow Moon" when it occurs in this month; when it doesn't occur, February's moon is known as a "Black Moon".
The next Black Moon will take place in 2037, while the last one was in 2018. These Black Moons may not occur all over the world due to time zone differences.