Make it wireless
If you find an outdoor friendly HD webcam you like, but it is wired only, you can make it wireless with a "wireless to Ethernet bridge", such as the Buffalo Technology AirStation N300. I've done with with several Stardot Webcams and it works great (down to about 0 degrees). I purchased a project box from Radio-Shack to protect the bridge from the elements, then mounted everything on a 2x6 board.
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