A/C should NOT be able to come on below a certain temperature(40*F ?? ) ! The mfr of the A/C systems determines that.
What may help, is to put on high heat- recirc mode to get the cabin warm/hot, then crack open a window, put on 'fresh air', to get rid of the moist air.
'recirced' cabin air gets hotter, faster than always new, frigid outside air , so this should 'clear out the moisture faster.The less snow you bring in on your boots and coat, the less condensation you'll have.
I had to scrape off the ice on the INSIDE of my CJ-5 windshield until someone said 'knock off your snowy boots'.......