It's impossible to say how often people see a "Saturn sky" because the term isn't a recognized astronomical or meteorological phenomenon.

Here's why:

* "Saturn sky" is not a defined term: There's no specific event or condition that causes a sky to be labeled as "Saturn sky."

* Saturn is a planet: While we can see Saturn in the night sky, it doesn't affect the appearance of Earth's sky in any significant way.

* Weather and atmospheric conditions affect the sky: The appearance of our sky is primarily determined by factors like clouds, sunlight, and atmospheric composition.

What you might be thinking of:

* Saturn's rings: Saturn's iconic rings are visible through telescopes, but they don't affect the way our sky looks.

* Saturn's position in the sky: While Saturn's position in the sky changes over time, it doesn't create any unique visual effect on Earth.

* A specific sky phenomena: Perhaps you're thinking of a specific sky phenomenon like a sunrise, sunset, or aurora, which could be misremembered as a "Saturn sky."

If you can provide more context or details about what you mean by "Saturn sky," I might be able to give you a more helpful answer.