Clear skies is a picturesque phrase that describes perfect weather with cloudless conditions and a vivid blue atmosphere. Synonyms for "clear skies" include "cloudless heavens", which portrays a serene and unobstructed celestial view. Another alternative is "unobscured firmament", which emphasizes a spacious and undisturbed sky. Moreover, "crystal-clear atmosphere" conjures up an image of absolute clarity and purity, suggesting a flawless expanse above. "Unclouded azure" evokes a deep, vibrant blue hue stretching as far as the eye can see. Lastly, one might use "cloud-free horizon" to emphasize an expansive and unimpeded view from end to end. These synonyms beautifully capture the essence of a pristine and unobstructed sky.