blue sky

This is a general tag that can be used whenever there is a blue sky within an image. A blue sky can often be found within the background of an image that takes place outdoors. Nevertheless this tag is good for specifying the color of a sky in an image.

Related tags

day - A light blue sky tends to indicate that it is day time within the scene.
night - A dark blue sky indicates that it is night / evening time within the scene.
sky

This tag implicates sky (learn more).