How much does a cloud weigh ?

A lot. If 1lt = 1 kg of water. Depends on the size. But I'd say it's pretty heavy.

1.1 million pounds for cumulous clouds

Enough to rain on your parade.

couple of tons to hundred to few thousand tons, depending on their size and density.

I know this won't clear up the cloudy question, but clouds like people come in all weights and sizes.

It depends if it's been raining or not.

How much water does it contain?

well its wireless...get it...wireless sounds like weightless...get it...get it

That's rather personal! :)

almost as much as your mom

Nothing, else they'd fall...