A calendar month without a full moon is one of several meanings of the term "black moon".
This type of black moon only occurs in February and happens approximately once every nineteen years. The phenomenon's time zone dependent but, for observers in a UTC time zone, the last two were in February 1999 and February 2018 and the next is scheduled to occur in February 2037.
If a February is without a full moon, then the preceding December or January and the following March or April will have two full moons.
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