What do you mean it's cloudy in hell?

"cloudy in the underworld" weather is mainly cloudy, with occasional cloudy weather.

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Introduction of meteorological terms:

1. overcast: In the sky, the total amount of low clouds is 8/1 or above, and the sunlight rarely or cannot penetrate through the clouds, and the sky is dark.

2. Cloudy weather means that the coverage of clouds in the sky accounts for four to eight tenths of the sky.

3. watch out for ultraviolet rays when you are active in cloudy weather. Ultraviolet is the general name of radiation with wavelength from 1 nm to 4 nm in the electromagnetic spectrum, which can't be detected by human eyes, but too much ultraviolet may damage eyes.

4. In cloudy summer, people should not forget to protect their sensitive eyes, because some ultraviolet rays can still pass through the clouds and reach the surface, which may cause some damage if they are exposed to these ultraviolet rays for a long time.