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Given the information above I'd say its mighty unfortunate that the stock rear window angle is somewhere between 30-35 degrees...
I could have guessed it wasen't optimal as on my drive to work this morning the layer of frost and a dusting of lighter snow gave me a bit of real world wind tunnel visualization. The outer 1/4 to 1/3 of the read window clearly is turbulent right from top to bottom as both the snow and heavier frost were blasted off almost immediately in waht appeared to be random directions (some floating off the trunk some crossing the trunk some levitating before falling to the ground, some floating across to the other side of the road, ect.). I would guess the center top of the window has flow separation within about 2 inches of the top as the snow in this area was swept off and the frost peeled it self from front to back flying cleanly off the car a couple feet above the trunk. The center base of the windshield was kinda fun to watch as it showed it has a recirculating bubble that goes almost 1/2 way up. For about 6 blocks till I came to a traffic light the initial dusting of snow tumbled round and round in the same spot. The final point of interest is the patch of frost with a small patch of snow in its center which sat in the center of the rear window spanning from a few inches fron the top down to almost the center of the rear window. This was never removed on my 14 block drive to work, although I was able to blow the snow off it with a quick puff like you would blow candels on a bithday cake out with. I couldn't remove the frost with breath alone but brushed it off easily with my glove.
I think have officially had WAY too much fun on my drive to work.
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