Related Clues:

• Heavens
• High places
• Meteorologists' study
• What's up?
• The heavens
• Irving Berlin's 'Blue ___'
• Weather word
• Berlin's 'Blue ___'
• Upper regions
• Berlin's "Blue ___"
• Cloudy areas
• Hits high into the air
• Heavens above
• Berlin's "Blue __"
• They can be clear or blue