The moonbow typically appears for about five nights each month, starting from two to three nights before the full moon through two or three nights afterward – but only when the weather is clear. If it's cloudy, there won't be enough light.

Are Moonbows rare?

Lunar rainbows — moonbows — occur less than 10 percent as often as normal rainbows. Moonbows need a few additional conditions to form, which is why they're so rare. Although well known, rainbows themselves are not common — most places see fewer than six in a year.

How many Moonbows are there in the world?

But where can you go to actually see a moonbow, since they are so rare and hard to find? Currently, there are only two places on planet earth where moonbows can be seen on a consistent basis: Victoria Falls on the Zambia-Zimbabwe border and Cumberland Falls near Corbin, Kentucky.