How is the weather today?

1. It's partly cloudy.
2. It's showery.
3. It is raining cats and dogs.
4. it is wholly cloudy.
5. It's foggy, so I cannot see buildings clearly.
6. It's stormy here, so I can not go out. I am scared.
7. It's thundering and lightening.

(Are the answers all grammatical? Would you correct errors, please?)

#4 - It is completely cloudy.

It is completely overcast.

#7 - Use "lightning" not "lightening" -- they are two completely different words.