The sky that is blue in your dream indicates freedom, happiness and overall happiness. The grey sky or the one that has many clouds in it represents your melancholic sometimes even depressing moods. It is more common to dream such dream for people who live in North, because of the lack of the sun, therefore such dream wouldnt mean anything bad. The sky that is dark and looks scary indicates the things you are afraid of such as your future, health of your family and so on. The night sky represents the qualities that has no ending, the dream shows that you have limitless opportunities to do whatever you like. To get more information about your dream please see the meaning of clouds.
Read more about dreaming of Sky in other dream meanings interpretations.