When you speak, I break. What am I ?

Question

When I drop, you shiver,
When I rise, you break out in sweat
I'm always there. I'm always around you to some degree. But to you I differ whether you're dry or wet. What am I?

Answer 1

Silence.............................

Answer 2

Silence!!
When speaking it,
the voice is audible
and silence is mute.