A score based on the current cloudcover. 10/10 means no clouds and 0/10 means the entire sky is covered by clouds.
A score based on the current brightness of the moon. 10/10 means no moon brightness(new moon) and 0/10 means the moon is very bright(full moon).
A score based on the current brightness of the sun. 10/10 means the sun is at its dimmest (middle of the night) and 0/10 means the sun is at its brightest(around 12:00).