cloudy sky
covered sky

The race got off to a clean start under mostly cloudy skies.

With the moon down and the sky mostly cloudy, it was very dark.

Yet I am like a flickering star over a cloudy sky.

There was a strong wind blowing that day too, out of a dark, cloudy sky.

The moon was huge and low in a cloudy, dark sky.

He looked up at 'his' hill, a gray mass under the cloudy sky.

I can track last week's eagle in a cloudy sky.

She looked up at the sun, which was not easy to find in the cloudy gray sky.

The background shows some soft trees against a cloudy sky.

Thus under cloudy skies, or even at night, animals can find their way.