* Lunar Phases: The moon goes through phases, from new moon (completely invisible) to full moon (fully illuminated).
* Visibility: Even when the moon is not full, it's often visible, especially as a crescent or gibbous moon.
* Weather: Clouds can obscure the moon even when it's otherwise visible.
* Location: Your location on Earth affects when the moon is above the horizon.
However, you can say this:
* There is always at least one day a month where the moon is a new moon. During this phase, the moon is positioned between the sun and the Earth, making it invisible from Earth.
* There can be other days when the moon is difficult to see. This might occur during the waning crescent phase, especially if the moon is low on the horizon or obscured by weather.
So, it's not a fixed number. It depends on the specific month, your location, and weather conditions.
