Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky. (Photos:Weather China; compiled by Peng Temin)

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.

Colorful “auspicious” clouds appeared under the clear blue sky of Beijing on Saturday. The very rare rainbow-like clouds are thought by some to be lucky.