Stealthycat,
I think what hurts it the most is the "prolonged" exposure to cold. Sometimes the temps here will not be above freezing for several weeks at a time-last year almost 2 months without a day above freezing. Sometimes the camera will have several inches of snow frozen on top of it. A day or two does not seem to hurt at all.

I don't know much about the homemade cameras, but I do appreciate the camo job on my cameras-blend in real well.

Jeff...U.P. of Michigan.