What factor is cited as the most significant, aside from clear skies, in determining visibility of the Geminids?

Answer

The phase of the Moon

Moonlight acts as natural light pollution, washing out fainter meteors; therefore, the Moon's phase is a critical factor for planning observations.

What factor is cited as the most significant, aside from clear skies, in determining visibility of the Geminids?
SpaceastronomyVisibilitymeteor showerGeminids