Front wipers, snow and defroster

[HummerN23]

Wow. 15 degrees here. 20" snow. DC Area it's like a disaster, states of emergency yada yada yada.

anyway, driving to 50 miles round trip to work today, went fine except for the front windshield. I had the defroster on 90 degrees cause the windshield kept icing up where the driver side wiper stops. then the wiper would ice up then the whole window iced up. what's up with that??? this iced up after about 35 minutes. i stopped and cleared off the front window then it iced up again in about 10 minutes. then the defroster would stop for about two seconds every five minutes or so...

then the rear window iced up after about 45 minutes even with the rear defroster on and the wiper running.


WHAT'S UP WITH THAT???