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With the ends open it wouldn't be too dark
Many light colored tarps allow quite a bit of light to pass through
This place even has clear tarps:\
http://www.ysbw.com/
http://www.ysbw.com/Clear-Heavy-Duty-Plastic-Greenhouse-Tarps-s/104.htm
The only way to keep snow out of an A-frame is to cover it completely
You'll basically need to build a tent over it if you use tarps
Cheap blue tarps don't hold up well to weight, so the sides need to have a steep slope
You could just cover it by laying the tarp directly on the frame, and...