What am I supposed to be?

Question

This one is probably very easy. I'm still trying to getting the hang of more complex structures :)

I hover, I freeze,

I mourn, I cry,

I move, I fade,

my color shapes your mood,

when I'm not there you feel warmth.

Alternative final line (only as an assist):

when I'm not there you feel the sun.

Answer 1

I think it's

clouds

I hover, I freeze,

Clouds are above us thus hovering the earth
Sometimes, they produce snow and hail

I mourn, I cry,

Sometimes, they produce rain

I move, I fade,

They move with the wind, and they fade when there is no water anymore.

my color shapes your mood,

When they are grey they can make you sad, when they are red (sunrise or sunset) they make you happy

when I'm not there you feel warmth.

When they are not here, they are not in the way of the sun's warmth.