tiān​sè

time of day

天色 tiān​sè
time of day noun
the hour or time of day as indicated by the light in the sky

It's getting late; let's hurry home.

sky appearance noun
the color of the sky or the state of the weather

The sky is overcast; it looks like it's going to rain.

Frequency

Movie subtitles
1.19 per million appears in 1% of films
Written text
4.51 per million

Sources

Definitions
CC-CEDICT