Car's Windows fogging up in cold weather?

I live in Las Vegas and it gets pretty cold here in winter, especially when it rains. My car gets fogged up like nothing in a matter of minutes. I turn of the Defrost button and nothing really happens. Sometimes I can't even tell where the road is at. I wipe the windows before I leave but sometime it has ice and I can't wipe it off and I bring down the windows too.

It's 1999 Ford Taurus.

What can I do to prevent this.
 
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