Not being cute but 3M makes a clear duct tape with virtually invisible cross stitching. I used it to cover small flaws in my tail lights until I could find suitable replacements on eBay. This could work on your rear window until spring.

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John
'02 Isuzu Axiom Canal Blue Mica "Wonder Car"
'02 Isuzu Axiom Garden Green Mica from Alaska "Sara"
'97 Ford Taurus Wagon 225,000 miles Intense Black "Batmobile"
'91 560 SEC Ice Blue Metallic "Big Benz"
'84 380 SL Astral Silver "Pretty Girl"
MBCA member
Chance favors the prepared mind.